Hello, I played Android today with my girlfriend and used the proposed variant of 4 suspects. Everything worked great and it's a great 2 player game.
We also played that when one of us got a jump on the case it could change the hero marker to the other player. Are you playing 2 player games like this too? Alternating the first player didn't really seem a good idea because we'd both get 2 turns in a row. Any other proposed variants to change the first player with 2 players?