A London curator loses the Mona Lisa to a collector, who discovers it's a fake.
| Actor | Role |
|---|---|
 C. Aubrey SmithJames Collison | James Collison |
 Erich von StroheimCarl Hoffmeyer | Carl Hoffmeyer |
 Stephanie BachelorToni Collison | Toni Collison |
| FForrester HarveySam Todworthy | Sam Todworthy |
 Doris LloydEmma Todworthy | Emma Todworthy |
 Richard FraserRobert Cartwright | Robert Cartwright |
 Eva MooreMary Collison | Mary Collison |
 Victor VarconiJules | Jules |
 Emil RameauProfessor Renault | Professor Renault |
 Frederick WorlockJohn Brent | John Brent |
 Olaf HyttenPurvis | Purvis |
| TTarquin OlivierYoung Cartwright | Young Cartwright |
 Georges MetaxaHenri | Henri |
 Colin CampbellWaters | Waters |