The Killer in Room Five by Sam Holland

A terrible confessionIn an isolated room in Hollowpines, an infamous psychiatric hospital, Joe Sinclair is confessing to a violent murder.An impossible crime Locked away, Joe couldn’t possibly have killed the man, so how does he know so many of the horrifying details?A detective at her limitsSuspended after a colleague was stabbed on her watch, DC Abby Fox has only just returned to work. But at Hollowpines, she must find out what really happened and how exactly Joe is involved.Is he to blame, or the only one who can stop the killer?