Luke Brandon, a private detective from the “Star” agency, arrives in the resort city of San Rafael in response to a telegram from his partner Sheppy. It seems that away from their native San Francisco, a profitable job is starting to take shape for them. However, the meeting of colleagues doesn’t happen—Sheppy is killed in a beach changing booth. Brandon is forced to begin investigating against the wishes of the local police and the criminals.
A souvenir from the “Musketeers Club” is a small package of matchsticks with pull-off tops. Solving the riddle of this item means finding the key to the murder.