The team goes deep in the shadows to trounce a crime ring that is planning a big diamond heist, with Dean and Jaimie establishing rapport with a major player by posing as a married couple. Meanwhile, Melissa informs Ty that she wants to start a family, a development that causes Ty to reconsider his dangerous profession.

The covert crew penetrates a turf war between two feuding gangs, one of which is a new and highly dangerous pack that's trying to seize the heroin market. In other developments, Ty's cash-strapped sister is in need of $7000, which Ty and Melissa can't provide.