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Lacey Sherlock’s life is forever changed when her beloved older sister’s body is discovered in an abandoned warehouse, with multiple stab wounds. She is the fourth victim of the String Killer, the handle the media have given the murderer who leads his victims into a maze with a ball of twine. Seven years after Belinda’s death, Lacey, now an FBI special agent, is paired up with computer whiz Dillon Savich in the Bureau’s Criminal Apprehension Unit (CAU), where Dillon has developed a predictive analogue program to aid in the apprehension of serial killers. When the String Killer strikes again, Lacey immediately spots his handiwork, resulting in his capture. The suspect confesses, but maintains that he did not kill Belinda. Thanks to Dillon’s expertise and her own detective work, Lacey confirms the killer’s innocence in her sister’s case. No sooner does she clear him than an attempt is made on her life, and Lacey suspects it is the same person who murdered Belinda years ago. Together, she and Dillon must discover who killed her sister before they both become the next victims.