Slip, Sach and the gang get mixed up in political intrigue when they try to help an exiled European king and his daughter regain the throne that is rightfully theirs.

When the boys discover that Sach has a strange ability to sniff out diamonds, they hatch a scheme to make money out of it.

Chuck, a reporter for The Blade newspaper, gets beaten up while trying to get a story on prison corruption, and the rest of the Bowery Boys, Slip, Sach, and Butch,…