A Bitter Feast by S.J. Rozan

Four restaurant workers have gone missing in Chinatown, and the local cops don't seem all that concerned. Peter Lee, a childhood friend of Lydia Chin and a lawyer working on behalf of the Chinese Restaurant Workers' Union, asks her to find them. When a bomb explodes at the union's headquarters, Peter is critically injured and another, unknown man is dead.

Lydia, joined by her partner Bill Smith, goes undercover as a dim sum lady at a local restaurant to find out more about the missing men. She discovers the smuggling of illegal immigrants, heroin, Chinese mobsters, and federal agents working at cross purposes.

Anyone who enjoys mysteries that emphasize characters, such as the books of Julia Spencer-Fleming and Elizabeth George, will want to read this series.

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.