Spider Shepherd: SAS (Volume 2) - Stephen Leather
This is the second volume of six Spider Shepherd short stories in one volume. The short stories, set back when he was in the SAS, are Personal Protection, The Rope, Planning Pack, Friendly Fire, Dead Drop and Kill Zone.
They were all written and published as individual short stories and were brought together for this collection. They help to explain who he was and what life was like for him before he left the SAS to join the police and then MI5.