Perfect sins

"Four years ago, Gabriel Ash was working with the British government investigating hijackings in Somalia. But when his wife and sons disappeared, presumably taken--and probably killed--by pirates, his life fell apart. He has sudden reason to hope when a senior policeman suggests that his sons might still be alive--until that policeman is murdered. Still, there seems to be some link to a local operation, and Ash, no longer a government agent, is determined to find it. Meanwhile, his friend Hazel Best has been having a tough time of her own. A police constable whose last case ended with her…