The title is also the moniker of a renowned safe-cracker, Slippy McGee, who has always managed to evade capture until his latest job, when he is wounded.
"Katy" Didd holds up the stage in which his sweetheart, Alice Mason, is traveling to her wedding to Prince Tetlow, to whom her guardian insists that she be married.
Orphan Enid White becomes the ward of a cruel man. She gets close to her guardian's wife and also to his son, who secretly comes to visit when his father is not around.
Jack Standish feels responsible for the failure of the partnership with his father and goes to the South Seas where he falls prey to alcohol, is seduced by Lullaby Lou, a vamp, and tricked by a brutal plantation owner, Gordon Van Brock.
A young man is raised in the mountains by his prizefighter father. Although he possesses great strength and athletic skill, he is completely out of his league when it comes to women.
Inventor Peter Marchmont has discovered a purple light that renders the user invisible. On his release from prison, Marchmont, disguised as Victor Cromport, uses the light to revenge himself against his former wife, Jewel, and her partner, James Dawson, who framed him for theft.