John Forrest, an insurance investigator with a weakness for model railways, is on the trail of a gang of smash-and-grab thieves targeting Europe's most prestigious jewellers. As the chase leads him to Ireland, Forrest finds he needs help and who better to call upon than his impossibly elegant, highly capable wife, Alice?
| Actor | Role |
|---|---|
 Jack BuchananJohn Forrest | John Forrest |
 Elsie RandolphAlice | Alice |
 Arthur MargetsonMalvern | Malvern |
| AAnthony HollesPolino | Polino |
 Edmund WillardCappellano | Cappellano |
 Lawrence GrossmithRankin | Rankin |
| ZZoe WynnCarole | Carole |
| EEdward LexyInspector McInerney | Inspector McInerney |
| NNigel FitzgeraldCosgrove | Cosgrove |
 Laurence HanrayPraskins (as Laurence Hanray) | Praskins (as Laurence Hanray) |
 Sarah SeegarMiss Quincey | Miss Quincey |