Clive Merrison and Michael Williams star as Holmes and Watson in the fourth collection of stories from the unique fully dramatised BBC Radio 4 canon

The Dying Detective - Holmes is struck down by a rare tropical disease and death seems imminent. His only hope lies in a planter from Sumatra whose expert knowledge comes at a price.

The Disappearance of Lady Frances Carfax - Watson goes to Switzerland to find an aristocrat who has vanished, but the trail leads back to a funeral parlour in London.

The Devil's Foot - Watson enforces a relaxing holiday on Holmes to cure his work-related exhaustion. The eerie Cornish coast provides exactly the opposite when death and horror strike a local family and Holmes risks death to solve the case.

His Last Bow - Holmes is lured away from retirement to help his country on the eve of World War I and employs one of his most successful disguises to penetrate a German spy ring.