A sixth and final instalment, Endgame, was released on September 16, 2021.[2] The book picks up immediately after the events of Crossfire, while containing flashbacks to the night of Dan Jeavons' murder.
It is revealed that all the guests at Dan's party were invited due to their hatred for Tobey, and that Dan had had a confrontation with every one of them during the night: Eva, his right-hand woman, for her trafficking drugs and people against his and Tobey's orders, Tobey, for his intentions to break off their alliance upon becoming Prime Minister, and Sephy, over his extortion of money from her and Nathan's restaurant along with Sephy's belief he'd had Nathan executed.
Sephy left the party early but later returned to find Dan dead; she was caught on CCTV handling the murder weapon, leading Tobey to believe she killed him. Upon discovering this from Callie Rose, Sephy tracks down and questions several of the other guests, deducing the real murderer's identity. Sephy also accepts Sonny's proposal, but continues to suffer from nightmares of Callum, still tormented with guilt over his death 36 years earlier.
Having concealed Sephy's presence at Dan's party, Callie Rose is arrested for obstruction of justice, and despite being quickly bailed out, her legal career is effectively ruined. She and Tobey work relentlessly to track down Troy and Libby, enlisting the aid of Callie Rose's trusted private investigator Duba and Dan's former primary enforcer Jarvis. The former lovers gradually reconcile, particularly after Tobey vows to do whatever is necessary to regain her love and trust, even proposing to her.
Duba is revealed to have manipulated Misty into abducting Troy and Libby, though absent when Misty was killed. Evading and killing several of Eva's enforcers, Duba retrieves Troy and Libby, anonymously contacts Tobey to reinstate Misty's original deal for a vast amount of money, and locks the teenagers in a car rigged with a bomb.
Sephy, Callie Rose, Tobey, Duba, Sonny, and Jarvis then confront Eva, who has seized control of Dan's criminal enterprises and has had Owen Dowd assassinated. She admits to hijacking Troy and Libby's kidnapping and having Misty killed, but also informs them that neither she nor Dan ordered Nathan's death, confirming that Sonny murdered him. She also reveals that Tobey was the true crime lord all along, with Dan acting as the decoy leader of his operation, but that he planned to abandon his life of crime upon being elected.
Deducing that Duba abducted Troy and Libby, Tobey tracks his phone, and the police rescue the teens. Duba tries to kill Tobey, but Sephy intercepts the bullets and is fatally wounded, while Tobey overpowers and kills Duba. Sephy dies in Callie Rose's arms after telling her to save Tobey. Five days after Sephy's death, Sonny is involved in a car crash that renders him comatose.
In a video message recorded by Sephy prior to her death, she informs Callie Rose and Tobey that she discovered Dan was murdered by his butler for impregnating his teenage daughter. The group elects not to turn in the culprit, and the case against Tobey is ultimately dropped due to lack of evidence, allowing him to continue as Prime Minister.
Jarvis murders Eva and assumes control of the criminal underworld on Tobey's orders, but Callie Rose finds out. Taking her mother's last words to heart, she agrees to marry Tobey in order to save him from himself, on the condition that he commits no further crimes and to always be completely honest with her. Libby finally meets her father, and she moves in with Callie Rose, Troy and Meggie, as does Tobey following the wedding.
During the next three months Libby is elected head student of Heathcroft High, and she and Troy form a sibling relationship and undergo therapy for their experiences, while Callie Rose considers starting a career in politics.
