Dead Man's Footsteps by Peter James

Broke Englishman Ronnie Wilson is in New York City on September 11th to try and work a deal with his old friend who works at the World Trade Center. Six years later, Abby Dawson is living under an assumed name in Brighton and fears someone is out to get her. When Detective Superintendent Roy Grace's team is called to investigate a skeleton in a tunnel, the lives of these characters intersect. Grace and his colleagues have to wade through lies and fake identities and travel to two continents in order to unmask the killer. Dead Man's Footsteps is another worthy addition to the Roy Grace series. It's such a pity that no American publisher has picked up these books after Carroll and Graf (now defunct) published the first two (this is the fourth). A great read-alike for Peter Robinson.