In the custom house a double-topped trunk in which are secreted several valuable gems is discovered. Carey Crane, at the head of the service, tells the inspector to leave the case to him. Later in the day Carey, dressed as a baggageman, drives up to the rear of the building. It is not long before Swithers, one of the gang, approaches Carey and directs him to get the trunk in question. He gives him an address to which they will deliver it. Carey takes the trunk to the address designated and deposits it in the room. While Swithers' back is to him, he raises the blind, which, unknown to him, is the signal to the thugs across the street, should anything go wrong with the crooks' plans. In lifting the trunk, Carey loses one of the brass buttons from his uniform under his overalls. Swithers picks it up and confronts him with a gun. Noiselessly Carey dislodges the clock on the mantel, and it falls so that it throws the gun from Swithers' hand just as the thugs appear. Carey grabs the gun and holds the thugs at bay. He manages to throw the clock out of the window, which arrests the attention of the policemen whom he has told to follow him. The crooks are eventually rounded up and jailed.