Loved it.
I like the tangle of betrayal that Helena, Dick and Agent 1 have caught themselves up in, largely as a result of following their assumptions about each other rather than the evidence. Though, to be fair, Helena's the only one who's been presented with any evidence so far. The other two are working in the dark. I do wonder what Helena's actual plan was though. She seems to have faith in Dick not to be the murderer of spies, but she doesn't actually say that she thinks Agent 1 is either. That's just being assumed by Ashemore and Netz.
In theory at least, working to split the two up by implying to each that the other is a traitor should have safeguarded Agent 1's life rather than exposed him to extra risk, since in the past fake-Dick has been following in Dick's footsteps. The trail of mayhem ought to have followed him to Corsica instead, but I guess he's just stubborn about sticking to his original targets. Otherwise it'd probably be Lex in the crosshairs.
I'm wondering if we'll see the Duchess again. Her reappearance here, and gun grabbing exploits, seemed to hint that she was a little bit more than just a rich woman with an interesting necklace. Maybe she'll follow it.