Perfect crime - 5

Stephen Berry is about to jump off a bridge until suicide prevention counsellor Damien Maclure stops him.

One week later, Stephen Berry is found dead at the bottom of a cliff.

But did he take his own life or was he pushed? A spate of murders sweeps across Edinburgh, and to make matters worse for DI Luc Callanach and DCI Ava Turner, the victims seem random and entirely unconnected.

With no clear method for how the killer chooses their victims, Callanach and Turner are under more pressure than ever to identify the killer before it's too late.

But as a separate murder case rears its head and places Callanach as the prime suspect, it seems like this killer might just be uncatchable.