There MUST be more to the 'secret' than Kassim being Nessa's, I agree, Squidgy, otherwise she wouldn't still be saying the secret was safe. I don't know what it is though!
I don't believe Atika and Nessa had a relationship, but that Nessa wanted one.
Hadn't thought about Monica actually being involved in setting up the wire tap, but it's possible – although yes, surely as a US based operator she'd be pro-Israel ...?
I don't know what I think about the bloke in the Rolls-Royce yet beyond that he/his company are obviously involved in blackmailing Nessa into giving him the contract. He must have something on her (the secret?).
I still don't know about hanged man.
Not sure how dialysis man is involved. If he's playing a game of which he's still in control, it's a VERY long game involving him knowingly getting his son banished.
Zero, it's Hugh. Ephra acts cool but I think he's bluffing. I don't think he wants to give away clues; he is in it up to his neck.