Pulp thriller writer Philip Marlow is in hospital with the skin complaint psoriasis, tormented by his past and threatened by his future. His memories, his 1930s-style gumshoe fiction and his disease weave him an altered reality.

Dennis Potter's drama about a patient struggling to keep his sanity, with the help of his alter ego, the singing private eye. Marlow faces a talking cure with a psychologist.

While in hospital with psoriasis, Marlow thinks back to the war when he was a little boy, and remembers seeing his mother having illicit sex in the Forest of Dean. His memories, his 30s style gumshoe fiction and his disease weave him an altered reality.