Twenty years ago, ornithology student Jessica Weston panicked when she heard a woman screaming for her life in the remote Barrington Tops. Her relief, when she discovers that it is a lyrebird making the sounds, is profound. She is thrilled to have caught his display on video. Then she remembers - lyrebirds are mimics. Whatever the wild creature has heard must have really happened and happened nearby.
Jessica takes her video to the police. Despite support from the newly minted detective, Megan Blaxland, with no missing person reported and no body, her evidence is ridiculed and dismissed.
Twenty years later, a body is unearthed, just where Jessica said it would be.
Horrified they let the case go cold, Jessica, now an associate professor and Megan, recently retired but brought back to head up the investigation, reunite and join forces. They are determined to find the killer, whatever it takes. What they don't realise is that they are not just putting their lives in danger, but also the lives of those close to them...
