Meredith and Lexie's father returns to Seattle Grace with stomach pains and a new girlfriend; Alex butts heads with the new OB; Mark bribes Jackson for information on Lexie.
Samcro exploits an opportunity to secure an important alliance.
After escaping a violent riot, Travis, Liza and Chris seek refuge with the Salazar family. Meanwhile Madison defends her home.
The team travels to Taiwan where a serial killer Clara pursued 16 years earlier -- with the help of the BAU's Emily Prentiss -- appears to be killing again.