S4·E4 Great Barrier

When Goren and Eames search for a jewel thief who murdered her accomplice, they discover that the clever larcenies are the brainchild of her lover, Nicole Wallace, Goren's long-standing nemesis. As the detectives delve into the personal and working relationships between the two women, they uncover a plot to cause the death of Wallace's ex-husband, the only person who can lead them to evidence of the very first murder Wallace committed.