Cath Hardacre is a hardworking and skilled nurse who loses her job for whistle-blowing and is forced to take drastic measures to provide for her daughter. Out of desperation, Cath seizes the opportunity to steal her best friend's identity as a senior doctor and start a new life in Edinburgh. Burying herself deeper and deeper in the imposter persona, she realises she could get everything she ever wanted - but with her old life threatening to destroy her fragile creation, how far will she go to protect it?

Prepare to enter the dangerous world and troubled mind of Detective Inspector Ray Lennox, a man engaged in a disturbing battle with his own demons, through the demanding and very public medium of serious crime investigations.