The Insider — Mari Hannah

The thrilling second novel in the acclaimed Stone and Oliver series by award-winning author, Mari Hannah.

After their success in their last investigation, DCI David Stone has been promoted and moved to the Murder Investigation Team, taking DS Frankie Oliver with him. But there's a catch: the case they are given is the latest in a series of undetected murders. It's a baptism of fire for MIT's newest recruits.

In the incident room, the murder wall makes grim reading: three women have been killed within the past year and nothing links the crimes: no day of the week, geographical area, similarity between victims and, most importantly, no forensic evidence.

Joanna Cosgrove is the latest victim, her body discovered fully clothed close to a railway line on the south side of the river in the Tyne Valley. The MO is the same as the other three, but the words 'serial killer' are not welcome in Northumbria force.

And the manner in which she was killed is too close to home for Frankie...