Private detective Hannah Tree thought her troubles were behind her, until she finds herself tangled in a case far more dangerous than anything she's faced before.

A desperate mother searches for her lost daughter. Street kids are going missing. These kids bear identical tattoos and scars and speak of strange things-like "elders" and "soul police." Hannah suspects a cult, and when their bodies start turning up, she knows time is running out.

Teaming up with allies old and new - including a former cult member with a haunting past - Hannah follows the trail of clues into an isolated mountain stronghold. They will have one chance to expose the cult's web of abuse... but a single wrong move could cost them everything.

A tense mystery with razor-sharp twists, WHERE EVIL TREADS is the fourth book in Deirdre Oliver's Hannah Tree: Private Detective series.