Code Breaker

After his daughter Allison sees Argent fail in his attempt to run Scott down with his car, Argent decides to send Allison and his sister Kate to Washington. Stiles convinces Peter (the alpha) to spare Lydia's life after he bites her but in return he must help the alpha locate Derek. Meanwhile Jackson is called to get Lydia to the hospital, and Scott must cope with the girl he loves knowing his secret.