1: She found the name "Marjorie Gallery" in the back of one of the paintings, the fake, called around, found no such gallery existed, finally found it on her own accidentally, while walking around the marina.
2: no clue. I couldn't figure that out either.
3. She put 2 and 2 together after a lot of things didn't add up. He was seen with Nadia at a party, his story about Dad cheating with Nadia was proven to be a lie by a few reliable sources, the coincidence that he happened to have the key, bug mostly just the little lies, she just intuited. I think lots of what they're trying to show is that she's very cunning and smart.
4. Agreed, especially after that conversation on the bench at the beach.
5. WORST ENDING EVER!!! Spoiler alert below:!!!!!
So much does not make sense. She's smart and sympathetic, a normal person suffering, until the last minute of the series. Then: What The Funicular??? Makes no sense. How will she get away? What will she do with the (ahem) evidence that's sitting around on the boat? Where does she think she's going to go? She has no luggage no clothing no nothing. How did she all of a sudden become a professional sailor? What happens to Clios does he go back on Drugs? Did Irina really set up Negrescu, or did she just say that to save face with her son? HELP!
IS CONSTANTINE ALIVE? Fake passports for both of them. "Join me".
The only way the ending is halfway acceptable to me aside from her sudden personality change, is: that they already know that this is a season two this is a cliffhanger, and that last part of her going off the rails is a dream.