- Charlie Chan as Thomas
- Yvonne Roland as Emily
- Betty Adams as Rosie
- Richard Masters as Edward
- Lee Chan as Percy
- Arthur Hughes as Henry
- Mr. Cartwright as Sir Topham Hatt
- Charlie Chan, Jr. as Duck
- Mr. Hopkins as Toby
- Honorable Charles Zaraka as James
- Inspector Strasser as Gordon
- Dr. Burton as BoCo
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