'Human Game' by Simon Reid.
A very good read about the murder, of the fifty escapee's from Stalag Luft III and the lengths the RAFP and SIB went to arrest and bring to justice the perpetrators of this monstrous crime. Many on here have views about the RAFP and SIB but this was an investigation by no more 10 to 12 men who took a couple of years and they weren't about to let it go in bringing people to court and some to the gallows.
Also covered in 'The Great Escape' by Paul Brickhill. I found it a bit dry, but still required reading. They certainly didn't leave any stone unturned in looking for those involved in this terrible crime.