Jack Caffery Series by Mo Hayder

Jack Caffery Series - Detective Inspector Jack Caffery - young, driven, unshockable with The Met's crack murder squad, AMIP finds himself facing both hostility within the force and echoes of his past. Moving to the Major Crime Investigation Unit in Bristol he meets police diver Flea Marley and the elusive 'Walking Man' who helps him deal with the memory of a death long ago.

1. Birdman (1999)

2. The Treatment (2001)

3. Ritual (2008)

4. Skin (2009)

5. Gone (2010)

6. Poppet (2013)

7. Wolf (2014)