Arriving in port, the stevedores make short work of unloading the cargo from the Scarlet Queen. Suddenly there’s a big comotion, and a man is dead.
Firecrackers masked the gunshots fired from a snipers position, and the main suspect is a Chinese woman, but Carney believes her story, and sets out to defend her cause. As he makes the rounds to investigate, Philip provides picturesque commentary as he goes from place to place. He encounters disappearing murder weapons, and evidence.
Philip Carney and Red Gallagher closely scrutinize the scene of the shooting for clues. There isn’t much to go on, so what else can he try to force the killer to show himself? Using himself as bait for the trap, Philip catches the killer, and in epilog he tells the secrets of the mystery.