Someone is preying on the children of Overbrook Meadows. When Detective Damien Green is assigned to investigate the unsolved murder of ten-year-old Kandice Warren, he inherits a case that has already gone cold. The killer left behind DNA but no identity, no obvious motive, and almost nothing else to follow. Then Damien meets Kandice's mother. For months, Kelli has been conducting an investigation of her own. While the police moved on, the grieving mother studied crime scenes, tracked suspects, collected evidence, and uncovered disturbing connections the original detective missed. Damien knows he should tell her to stay out of his investigation. Instead, he begins to realize she may be his best chance of solving it. And Kandice wasn't the monster's only victim. As more missing girls are connected to the case, Damien and Kelli find themselves drawn closer-to the killer and to each other. But grief has changed Kelli, and her definition of justice no longer fits neatly within the law Damien has sworn to uphold. Soon, catching a monster will force them both to decide how many lines they are willing to cross. And whether some people deserve what's coming to them.