Twisted Sister

When McGee's younger sister Sarah shows up disoriented and bloodied at his door in the middle of the night while also believing that she might have killed someone, McGee takes matters into his hands, beginning his own independent investigation but Sarah claims she's innocent although her memory of the last few hours is blank. While McGee works on figuring out what happened to his sister, the NCIS team is investigating a case of a Navy sailor, who is somehow connected to McGee's sister. Both Tony and Abby are busy with love problems, while McGee turns out to have another secret.