Five women pick up their backpacks and start walking along a muddy track. Only four come out on the other side. The hike through the rugged Giralang Ranges is meant to encourage teamwork and resilience amongst office colleagues. Police investigator Aaron Falk has a keen interest in the whereabouts of the missing hiker, Alice Russell. Because Alice knew secrets about the company she worked for and the people she worked with.The four returning women tell Falk a tale of violence and fractured trust during their days in the remote Australian bushland. And as Falk delves into the disappearance of Alice, he begins to suspect some dangers ran far deeper than anyone knew.