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.

Ce synopsis est en anglais : nous ne l'avons pas encore traduit.