Six Degrees of Death — Marian Exall

The suspicious death of a much-loved English professor in a small Northwest college town connects six strangers. Is one of them the killer? It's always the husband, declares the jaded detective in charge, but a rookie cop assisting him isn't so sure. When the police investigation hits a wall, the former strangers come together to uncover unlikely links between the professor's death, Central American political corruption, and a secret document that names the criminals. Now they are all in danger, as an assassin seeks to eliminate any witnesses.