The work of Peter Ketley on Fisheries Research in Devon is being disorganised by a mysterious new method of salmon poaching. His young brother Bob, with the help of two children from London, eventually uncovers and catches the poachers.

Reparto

Jeremy Bulloch

Bob Ketley

Joanna Horlock

Susan

James Luck

Simon

Anthony Parker

Peter Ketley

Larry Burns

George

Bruce Wightman

Tom

Michael Collins

Arnold

Lane Meddick

Mr. Atherton

Armine Sandford

Mrs. Atherton

Ben Williams

Quarryman

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