A Hen In The Wolf House - relating to Agent Simmons working undercover in Hydra - was a wonderful slow boiler that built to an impressive, and informative, climax.
Under pressure from Hydra to get The Obelisk back from "The Doctor" (Kyle MacLachlan) - aka Skye's father - Raina tried to blackmail Phil Coulson into handing Skye over to her, so father and daughter could be reunited and The Doctor would then allow her to pass the alien artefact over to Hydra.
Raina uses her knowledge of Simmons' undercover position as her leverage, but Coulson calls her bluff... as he already has an extraction plan in place for the young agent.
It was a bit of a shame that I already knew that Adrianne Palicki was playing Bobbi Morse, aka Mockingbird, so her rescue of Simmons wasn't quite the surprise it should have been and neither was Coulson's casual mention to Skye that there was a theory she might be, at least, part alien.
This, of course, is a major plot point in the show as the whole hubbub about the blue alien corpse from season one has really blown up on the internet this week (as we're several weeks behind the States) and it's been impossible to avoid major spoilers (some news sites posting the nature of the alien in their headlines, which is majorly annoying).
However, that grumble aside (and it's not a reflection on Agents Of S.H.I.E.L.D. but rather the information-hungry age we live in, where being 'first' to discover a plot revelation is seen as more important than just letting people enjoy a show on its own merits), this was another winner.
Not only did we get to learn more about Skye's father - a brilliantly awkward performance by Kyle MacLachlan, like a man still not comfortable in his own skin - but Coulson finally let Skye in on the secret of the alien writing he has been channelling ... and she almost immediately knew what it was.
And I have to confess, possibly because they are characters I'm very invested in, I did get a little choked up when Simmons and Fitz were finally reunited after her spell undercover came to an end and she returned to S.H.I.E.L.D. HQ.