No Colder Place by S.J. Rozan

Bill Smith goes undercover at a construction site as a bricklayer--he hasn't laid a brick in more than twenty years. Equipment has been stolen, and one of the laborers has gone missing. When the missing worker is discovered, dead, in a pit on the site, Smith asks his partner Lydia Chin to join the investigation as a secretary in the construction office on site. She grumbles that her skills are wasted working as a secretary, and tells Bill as much. But when an experienced site supervisor falls to his death, Smith and Chin know it's not an accident.

This is the fourth book in the series--I stay up until all hours to finish these books. Every one has been exciting, with great characters and enough plot twists to keep up the interest.