While Senior Sergeant Addilyn Price is working a routine missing person's case in the Brisbane suburbs, the last thing she expects is to be invited to join Special Operations as part of a murder investigation.

But are Detective Graham Coltsworth's reasons for bringing her in entirely without agenda? Or does he have an ulterior motive? After all, he is renowned for working alone.

When the two officers are drawn into a historic serial killer cold case, Addilyn wrestles with the dilemma between doing what she is told, and what is right. She must decide between career and conscience as the pair seek to vindicate an innocent man and bring a killer to justice.

Will they be able to settle their differences in time to identify the killer known as the Double Spiral Strangler before he disappears again? Or will the elusive killer not only leave his mark on his latest victims, but the officers pursuing him too?