Nightrise is the third book in The Power of Five series, written by Anthony Horowitz. It was published and released in the UK on 2 April 2007 by Walker Books Ltd. It is preceded by Evil Star, released in 2006, and followed by Necropolis, which was released on 30 October 2008. The title refers to a fictional organisation represented in the book. And also it refers to the Old Ones' presence on Earth, and their spreading darkness.
The story begins with two boys, each 14, performing in a theatre in Reno, Nevada. Nightrise is to kidnap identical twin brothers Jamie and Scott Tyler, who are part of a magic show in the theatre. Their foster parent, Don White, sells the twins off to them for $150,000, but Jamie escapes and is pursued. Scott is captured but Jamie is rescued by a woman. He awakens at a hotel in which Alicia is renting a room. A woman who introduces herself as Alicia says that her son, Daniel, was kidnapped by the same corporation after exhibiting clairvoyant powers. She takes Jamie to his foster parents' house only to realise they were murdered; they escape only when Jamie uses his telepathic powers.
Alicia and Jamie go to Los Angeles where he reveals his backstory. He then tells her of his previous foster parents and the weird and inexplicable "accidents" associated with them. He tells her about the strange mark he has and that he thinks he is an Indian. After these incidents, he and Scott refused to read or control anyone's minds but each other's. They find a lead to one of the men that kidnapped Scott, Colton Banes, and Alicia persuades Jamie to read his mind to find out where Scott is. Jamie manages to find out where Scott is being held: Silent Creek, a juvenile Centre, where he is being tortured in an attempt to force him to side with Nightrise.
Alicia decides to seek help from her boss, John Trelawny, who is running for the presidency, and manages to convince him about Jamie's powers and to help him get into Silent Creek. Trelawny affirms Jamie's powers and agrees to help him. Jamie is given a false identity and criminal history, and is put into the juvenile Centre. He finds that his brother is in solitary confinement there and that Alicia's son Daniel is there too. One night, when he tries to use his power to demand that a power-hungry and abusive supervisor named Max Koring take him to his brother, he realises that his powers do not work in the prison, because of some magnetic field that neutralises special powers. Koring puts him in solitary confinement for his rudeness and secretly calls Banes to tell him he has found a Gatekeeper.
Jamie does not realise that the second gate was opened. In Peru, Richard and Professor Chambers find Pedro by the helicopter. Pedro tells them that Matt went by himself to stop the gate from opening. Thinking Matt is dead, Richard runs until he finds Matt. Matt "looks like all the life was sucked out of him" and is in a coma. After seeing he has a pulse, Richard runs back to bring get help for Matt.
Feather knew of the mysterious tattoo on Jamie's shoulder, having seen all of the boy's naked body during the embarrassing strip search at intake. He explains to Jamie that the twins are two of the Five, but Scott has already left Silent Creek. They work out a convincing plan to save Daniel and escape, whilst at the same time Colton Banes is on their way to Silent Creek. A fight goes on between Feather's tribe and Banes' men, resulting in Jamie being shot in the shoulder and Banes killed by an arrow.
Feather manages to break out with Daniel and Jamie, but Jamie falls unconscious when he is hit by a bullet, and a shaman is called on to bring him back. During this however, Jamie is transported back in time to the height of the war between humanity and the Old Ones ten thousand years ago in England. It becomes clear that the original Gatekeepers are exactly the same as the Gatekeepers in the present, just with different names (except for Matt, who says "I prefer to use my name from your world"). Matt is obviously the leader, and most knowledgeable of the Gatekeepers. He tells Jamie that he sent Sapling to his death on purpose, as the King of the Old Ones would then think he had won, however, should that occur, his counterpart from the future/past would take his place, hence why Jamie was there. Jamie then participates in the battle against the Old Ones, in which the Old Ones are defeated and banished, having mistakenly thought that only four of the Five could come together and letting their guard down. At the place where the Five congregate, a gate is built at the location the Old Ones were banished to, and would be called Raven's Gate by future generations. Jamie sees an eagle which Matt explains is there to take him back.
Jamie's body wakes up in the present and with Feather and Daniel travels back to Reno to reunite Daniel with Alicia, parting ways with Feather afterwards. When he is asleep that night, he is spoken to again by a grey man in the dream world of the Gatekeepers, to kill him.' He finally realised what it means, originally mistaking that Scott was telling him that he was the one going to be killed, but he realises that Scott is the person going to kill John Trelawny. Throughout the book, Nightrise has always wanted the other candidate, Charles Baker, to become president, who will support the return of the Old Ones. However, when Trelawny became too popular, assassination seemed the only option. It becomes apparent that this will take place during his birthday parade in his home town of Auburn.
Alicia, Danny and Jamie hurry to Auburn to stop the assassination. Jamie sees Scott with Susan Mortlake, a leader of Nightrise, in the crowd, and he tries to send a telepathic message to him, but it fails. Desperate, Jamie commands Warren Cornfeld, Trelawny's bodyguard and would-be assassin (being controlled by Scott), to aim the gun at Susan Mortlake. Cornfield shoots and kills Mortlake, and in chaos Jamie takes Scott and meets up with Alicia and Danny. They meet Natalie Johnson, a member of the Nexus and a friend of Trelawny, who gives them her car to escape. Policemen immediately come after them and the twins bid farewell to Alicia and Danny. Jamie and Scott use a hidden doorway in a cave at Lake Tahoe, and emerge in Cuzco, Peru at the Santo Domingo church. The twins find their way to the Nazca desert and meet with Matt and Pedro, the first and second Gatekeepers.
Meanwhile, Scarlett Adams takes an aeroplane to Hong Kong to meet her father, who works for Nightrise. As Scarlett is about to go she finds out that John Trelawny has lost the election and that it is suspected that Nightrise has rigged the ballots.
The Power of Five series is based on ideas from a series written by Anthony Horowitz in 1983–1989, Pentagram. Pentagram was meant to have five books, but only four were ever published. The third was The Silver Citadel. This novel has been largely changed, expanded and modernised to form Nightrise, notably through the omission of the Queen of the Old Ones, a significantly more detailed section set in the past, and the introduction of Scar (Power of Five's equivalent of the Pentagram series' character Will) a book earlier than originally.
- The Old Ones are remarkably different in the past than in the present; as in the present they notably consist of soldiers made of flies, and a ghostly cavalry, as well as giant animals. But in the past, the Old Ones are composed of half-human, half-scorpions, as well as half-human animals, consisting of half-human sharks, half-human pigs, and half-human dogs as well as unicorns with their horns being actual human swords rather than natural horns. This implies Chaos has been violating evolution. The reason for the Old Ones' physical transitions is not elaborated on, but could be implied to be a result of their long imprisonment
- This is the only novel so far which has all the Five together, in the real world, as previously they had only been present in dreams. Four of them get together at the climax and it is only Scarlett left to find them.
- This novel suggests that the Nightrise Corporation is what was financing the cult at Lesser Malling, as well as Diego Salamanda and other antagonists.
- Author Anthony Horowitz says that the chapters in which Jamie ends up in the past are "the most important in the novel."
- Even though one would assume this novel takes place after the Old Ones' release, it actually begins a few weeks before. This means that while Matt and Pedro are escaping from Salamanda with the Incas, Scott is kidnapped from Jamie and Jamie and Alicia are searching for Scott and Danny. It is only when Jamie himself enrolls at the prison to find Scott that it catches up with Evil Star and reveals the Old Ones' release.