In this film we see shots of a drama in which the 3rd Walsall Sea Scouts foil an international gang of gun runners near Holyhead. There are shots of men on the SS Roamer boat plotting to steal cargo and a secret device. Next there are shots of the Sea Scouts setting up a camp by the sea. After some of the scouts come across the scene of the theft we see shots of the boys back at camp and then one of the scouts dreaming about the haunted harbour at the bottom of the cliffs. He follows a man to a cave at the bottom of the cliffs where he finds the SS Roamer crew with the secret device. They chase after the boy once he is discovered with the device. The boy is eventually captured along with a female pilot who tried to rescue him and they are both taken aboard SS Roamer. They manage to take over the boat and raise the alarm to scouts back on shore. They find the device and capture the ringleader.
A Kinescout Production
From the book by Percy F. Westerman
Cast:
Joyce Hargraves: Muriel Thatcher
Dick Hargraves: Leonard Done
whose father owns the famous firm of Messrs Hargraves Ltd. Diving gear and salvage specialists, Holyhead
Cast:
Detective Courtney Mills: Stanley Gee
Otto Schwarz: A.C. Fraser Wood JP
The Ferret: D.S.H. Jones
Taff: Oliver Dickens
Deputy Asst. Commisioner: E.H. Green
Group Scoutmaster: L.G. Stanley
and Walsall Sea Scouts
Directed by Leonard G. Stanley I.A.C.
from the book by Percy Westerman