Who do you believe when the detective (albeit a self-appointed one) of a murder case is a patient in the same psychiatric ward where the body was found? Rabbit Hole by Mark Billingham takes the readers on this unbelievable yet fascinating journey. Alice Frances Armitage, aka Al, is a medically retired detective constable, who has been diagnosed with PTSD. After being sectioned, she is undergoing treatment in the acute psychiatric ward of Hendon Community Hospital. However, she believes herself to be a cop still. So, when Kevin, one of the patients, is found murdered in his room, Al takes it upon herself to investigate the case. Soon, she gets the feeling that her own life is in danger.