Five women reluctantly leave the city for a challenging hike across the rugged Giralang Ranges as part of a corporate retreat. Only four come out the other side. Federal Police Agent Aaron Falk has a particularly keen interest in the whereabouts of the missing bushwalker. Alice Russell is the whistleblower in his latest case - and Alice knew secrets. About the company she worked for and the people she worked with. In an investigation that takes Falk from corporate heartland to isolated bushland, he discovers that every person on that retreat had something to hide…