A Question of Loyalty — Peter Taylor

Investigating the murders of three men stirs up trouble for DI Alex Graham, causing him to relive a past tragedy. Working with his old lover, DS Best, Graham must delve deep into the men's military histories to find answers. Having witnessed one killing, and now hiding out in a safe house, Liz Hunt hears word of the other dead men - friends of her husband Danny, who has isolated himself on the North Yorkshire Moors. Is it disloyal to share her information with the detectives? DI Graham won't be resting until he can close this case - and with it, the door to his terrible past.