Just One Look by Harlan Coben

A convicted hitman suddenly confesses to a twenty-year-old murder - the slaying of a District Attorney's sister.

Why he chose this moment to reveal his secret, he refuses to reveal... A businessman tries to go on the run from his family home when an old photograph turns up in a new roll of film.

A photograph of him as a young man. But on leaving his house, he is immediately snatched by a vicious, trained killer and bundled into the back of a waiting car.

These things are linked, but by what, or whom, no one knows. Only that the past is coming back to haunt the present and people are getting hurt...