What Rule 12?

Eleanor "Ellie" Bishop works as an NCIS special agent and prior to that she worked at NSA, but she then got asked by Leroy Jethro Gibbs to join his team. Ellie has gone through a lot of stuff and most of it relates to relationships causing her to have walls up and her three big brothers being over protective.

Nicholas "Nick" Torres works for NCIS as a special agent, but doing deep undercover ops. One of his ops does not go well and so he stops with the undercover work and joins Gibbs' team. Right away he takes a liking to Bishop, but he can't go for her because of her being in a relationship and Gibbs' rules. Well rule number 12 to be exact: Never date a co-worker.

Will Ellie learn to love again after a divorce and a boyfriend being killed right in-front of her? Can Nick treat her like a true gentleman and break down those walls? What about Ellie's brothers? What about rule 12?