A newspaperman, his canine companion, and an adventurous socialite investigate an umbrella-wielding murderer who is terrorizing a London neighborhood.
| Actor | Role |
|---|---|
 George MurphyMichael Denis | Michael Denis |
 Rita JohnsonPatricia Herrick | Patricia Herrick |
 Virginia FieldBessie | Bessie |
 Leo G. CarrollCorrey | Correy |
 George ZuccoInspector Jefferson | Inspector Jefferson |
 Montagu LoveSir Arthur Herrick | Sir Arthur Herrick |
 Eddie QuillanBill | Bill |
 Leonard MudieSquires | Squires |
 J.M. KerriganTims | Tims |
| NNeil FitzgeraldInspector Sleet | Inspector Sleet |
 Harry StubbsPostman | Postman |
 Ivan F. SimpsonBurroughs | Burroughs |
| CCorkyJones - the Dog | Jones - the Dog |