This game takes place after the events in Blackwell 1: Legacy. (Blackwell 2: Unbound was a prequel that occurred in 1973.) Rosa and Joey have been working together for a few months and are a fairly smooth team now.
Unlike normal walkthroughs, in Nice Game Hints you can select just the puzzle you want hints for. Here are listed the puzzles for "When does this game take place?" in The Blackwell Convergence. The guide you choose only contains information about that puzzle, reducing possible spoilers for other puzzles.