Detective Cassidy Archer always gets the job done. She just may need to bend the rules to do it.

A single mom with a taste for danger, Cassidy prefers cases that will take her away from drab reality into the dark world of lawlessness. So when she's assigned to investigate the sudden disappearance of a young woman with little evidence that anything may actually be awry, she isn't thrilled.

But as Cassidy begins to learn more about Sarah Foster and those closest to her, the case is more intriguing than she thought. Sarah had been renovating her new house---a former school for troubled children---and uncovered some disturbing things left behind in its walls. Had Sarah exposed a secret someone is desperate to keep hidden? Struggling to balance Sarah's case with her responsibilities as a parent, Cassidy's personal life becomes intertwined with the case---and soon, Sarah is no longer the only one in danger.