Meredith Blake, a gentleman crook, learns that the millionaire, Robert Hamilton, has just obtained a priceless scarab. He decides to get it. Accidently his accomplice, “Spider,” finds an invitation to attend a reception at the Hamilton home. Blake poses as a detective and also attends. He secretes himself in Hamilton’s apartment while “Spider” awaits outside to aid in the flight. After Hamilton has retired, Blake emerges from his hiding place and by the light of the moon shining through the windows obtains the scarab. Hamilton awakes and the “Spider” leaps in and knocks him senseless. Judith, Hamilton’s daughter, hurries into the room at the noise and Blake, infatuated with her, has “Spider” carry her out into a waiting taxi. When Judith recovers from her faint she notes the number of the license. Tightly clasped within her hand she holds a fountain pen, which she unconsciously carried with her when disturbed in writing. On her white slipper she makes a plea for help and hurls it out the window of the cab. The slipper strikes Richard Neal, private investigator, who was on his way to the Hamilton home at the behest of the millionaire. He forms a connection between the two incidents and at the house learns of a heel print of peculiar markings. He discovers this to belong to the driver of the cab and finds that this driver is none other than “Spider.” By a ruse the crook is compelled to lead Neal and Hamilton to the hiding place of Blake where after a battle the girl is released and the scarab returned. The ending suggests that a love story will be the continuation of the exciting incidents.