Andrew Bullivant, a retired lawyer known as "Grumpy" for his irascibility, calls on all his experience and powers of deduction to expose Chamberlin Jarvis as the thief of a valuable diamond being transported by Ernest Heron. A gardenia is the clue; and Virginia Bullivant, Ernest's sweetheart, is Jarvis' unwitting dupe.
| Actor | Role |
|---|---|
 Theodore RobertsGrumpy | Grumpy |
 May McAvoyVirginia Bullivant | Virginia Bullivant |
 Conrad NagelErnest Heron | Ernest Heron |
 Casson FergusonChamberlin Jarvis | Chamberlin Jarvis |
| BBertram JohnsKeble | Keble |
 Charles OgleRuddock | Ruddock |
 Robert BolderDawson | Dawson |
 Charles K. FrenchWolfe | Wolfe |
| BBernice FrankSusan | Susan |
| BBertram FrankJarvis' Valet | Jarvis' Valet |