I wonder if anyone remembers this drama series from a couple of years ago. Don't think it was longer than one or two years ago and pretty sure it was on BBC, ITV or channel 4. It was something about a man who had to win the trust of a woman who had a priceless art collection. He went into her house several times to catalogue and value the collection and the house was behind a door in a wall. It was quite extraordinary and I dreamt about it last night. Googling has got me nowhere. I think there was a twist at the end, but don't recall what it was. It's driving me mad!