Wasn't too impressed tbh. I have never been remotely interested in the SUPER SECRET NINJA AGENT angle they took with Mary. I prefer criminal mysteries to that genre and as a character she was far more believable and enjoyable before that revelation. Like ffs can't she just be a clever character without a convoluted and cliched backstory?

Next episode seems to have the excellent Toby Jones playing a real evil dude though so here's hoping for a return to form.