Shortly before her sudden death Mildred Crosby promises Maggie Bolton a painting, which Maggie likes very much and in her will she leaves Maggie quite a bit more. Her son-in-law Roy Thornton has counted on inheriting the money and accuses Maggie of gross medical negligence and abusing her position as district nurse to influence the old lady. And all of a sudden the painting is missing. Has it been stolen by the same person or persons who have staged a series of burglaries in the area? Claude Greengrass and Bernie Scripps find a tramp, Seamus O'Toole, sleeping in Greengrass' barn. They discover that he can pick horse race winners when he is dreaming. This is too good an opportunity for Greengrass to pass by.