What has happened to Alice Russell?Five women reluctantly pick up their backpacks and start walking along the muddy track. Only four come out the other side. The hike through the rugged Giralang Ranges is meant to take the office colleagues out of their air-conditioned comfort zone and teach resilience and team building. At least that is what the corporate retreat website advertises. Federal Police Agent Aaron Falk has a keen interest in the whereabouts of the missing bushwalker. Alice Russell is the whistleblower in his latest case. She knows all the secrets: about the company she works for and the people she works with. Far from the hike encouraging teamwork, Falk is told a tale of violence and disintegrating trust. And as he delves into the disappearance, it seems some dangers run far deeper than anyone knew.