Mariana Etista. Reasoning that, upon discovering that Scotland Yard were reopening the case, she sent Chico to England to take the fall, the pair are forced to defer the case's closure so long as she remains on the run. A further slaying, that of a popular DJ at a radio station, also successfully resolved, the pair receive a personal request from the Commissioner to look into the deaths of a group of mafia members. The manner of their deaths all seem to be copycat murders based on the "Jigsaw Puzzle Killings", a 26 victim serial killing from four years ago that was never made public knowledge. Alfendi and Lucy ultimately deduce that one of the mafia members killed the others alongside an unknown female accomplice, only to be betrayed by her and himself killed. Some time later, Alfendi is alerted by Hilda Pertinax, an Interpol investigator he has history with, that Mariana Etista's whereabouts have been traced to a safe house in England, prompting the duo to make their first expedition outside of their offices. Upon uncovering Mariana's hiding place, it is revealed that her true identity is that of Diane Makepeace, the daughter of the Jigsaw Puzzle serial killer, Keelan Makepeace, who has followed in her father's footsteps and become an equally brutal murderer. She reveals herself as the one who orchestrated the mafia murders, and expresses a deep hatred for Alfendi, accusing him of "murdering" her father during a confrontation four years ago. Diane manages to escape, and sends an invitation to Alfendi to visit Forbodium Castle, where Al and her father had their fateful showdown four years ago. Arriving in pursuit of Alfendi, Lucy and Hilda are separated, and Lucy is locked in a room by Diane, who forces her to solve a reenactment of a murder in order to escape. Upon solving it, Diane tells Lucy that this was her father's first killing; Keelan had once told her he had help inside the police, someone who destroyed vital evidence in that particular case. Lucy is shocked to discover the investigator in charge of the case was Alfendi. As Lucy makes her way deeper into the castle, a gunshot rings out, and she and Hilda arrive on the scene to find Diane has been fatally shot, with Alfendi, who was being held captive by her, the only plausible culprit. Despite this, his "Potty Prof" personality asserts that