Sarah and the rest are to meet up in the desert at their new place.  Sarah and John take a detour to Charlie's house first while Cameron and Derek pack up the weapons locker.  John Henry gets hacked and must be shut down.  Sarah, thinking that she has breast cancer, secretly goes to the doctor but finds that she's got a tracking device in her instead.  She overpowers her attacker and heads back to the lighthouse.  She gets there to find Charlie floating in the water.