Paul Whitehouse and Bob Mortimer, alongside trusty terrier Ted, travel to the Crogen Estate in North Wales to fish the River Dee for the glorious grayling, a fish which has so far eluded Paul on their extensive travels.

They fish hard on a secluded private estate, while Bob sets up a bijou coffee shop and Paul tries to concentrate on landing the prized fish. Along the way, they try to rediscover their lost youth on this trip, with mixed results.