Dick Barrows, a young bachelor, who believes that the spirit of adventure is dead, is looking out of the window of his apartment when he sees a beautifully gowned woman seized by a black bearded man and bundled into a waiting taxicab. Dick rushes to the scene and finds a vanity box which contains an assortment of rare and priceless jewels. He sees the taxicab return and the bearded man looking for the lost vanity box. The taxicab again speeds away and Dick follows on a bicycle. He sees the man enter a skyscraper and follows him. He later discovers that the man was a detective and the woman a notorious jewel thief. When Dick hands over the vanity box the last link of the chain of evidence against the woman is forged. Dick returns home with his belief in the death of the spirit of adventure somewhat changed. - Motography, September 4, 1915
The release date is sometimes given as September 3rd but the 1st fits the release schedule and the ads.