It might be hard to make an accusation stick but please don't stay with a guy capable of such trickery.

But nobody dare make the accusation outright.

The player must move to the indoor swimming pool in the center of the board to make an accusation.

Once a player thinks they have the solution, they can make an accusation on their turn (you may do it without playing an action card).

Once a player thinks he or she knows the solution, the player can make an accusation.