NCIS: Los Angeles - Imposters

This episode starts with a man burning to death at a beach-side restaurant.  It turns out this man was beaten and burnt to death and was passing himself off as a U.S. Navy Seal, but he was an imposter.  Apparently he is associated with the missing radioactive canister from 'Overwatch' and the team must work to find it before it is used to build a bomb.
During this episode Hetty is acting strange.  She is talking to everyone (except Callen) and giving away personal items.  She tries to get Deeks to sign a form to join NCIS.  When they are all talking about it at the end of the episode, Callen realises that Hetty is putting her affairs in order.  They rush to speak to her and instead find Lauren Hunter (played by the wonderful Claire Forlani) who informs them that Hetty has resigned and that she is now their boss.
A great cliffhanger to lead into next week's season finale.