At an under-18s club night in Glasgow, a strong-willed teenager struggles to cope with the behaviour of her male friends.

When one of a group of friends downloads the mysterious Red Rose app, plans change. What starts innocently as a game of admiration rapidly descends into something much darker.

The sharp, witty and enigmatic DI Annika Strandhed, as she heads up a new specialist Marine Homicide Unit (MHU) that is tasked with investigating the unexplained, brutal, and seemingly unfathomable murders.

After a strange encounter with his seemingly benign teacher, an isolated school boy must decide how to negotiate this contentious and intriguing relationship.