Former crime-scene investigator Megan O'Ryan helped convict the St. Patrick's Strangler, who killed Megan's sister. Now she's trying to heal in a small Wisconsin town. But a copycat killer is at work in Crystal Lake, and Sheriff Luke Torretti needs Megan's help...on the case and at home, where the widower's troubled teenage son has become a suspect. The boy claims he's innocent--and Megan believes him. Because the more she and Luke investigate, the...