I had some trepidation approaching this game, as, based on the last Lady Thalia game, I assumed it would be:
-long,
-complex,
-requiring a great deal of thought,
-engaging,
and thus require some special time set aside. And I was right! If anything, this game exceeds the last one in all those categories.
You play two different women this time: one, the infamous lady thief Lady Thalia; the other, a policewoman named Margaret Williams, somewhat stodgy but dependable. Together, you are teaming up to stop a rival art thief who is obsessed with royal privilege and the trappings of aristocracy.
Play alternates between playing as Margaret, who investigates and prepares, and Lady Thalia, who follows up on Margaret's leads. There's a point system (which is humorously lampshaded in-game), and sub-systems including a relationship tracker between the two leads.
There are a variety of puzzles, with the most consistent one being a conversational system where you can choose between being flattering, direct, and leading someone one; most conversations give you 3 chances to find the 'right one', with a bonus if you get all 3 right.
The other puzzles for the most part involve retaining information from earlier and using contextual clues. There is a complex save system which allows for easy restoration (I did this quite a bit), but some choices have significant delays, so a perfect playthrough is quite difficult.
The characters are bold and well-written, and I'd consider this among the best crime/heist Twine games.