The Garths had farmed their fertile acres for generations, and fine land it was with the towering hills of the Lake Country on the far horizon. Here hot-tempered Robert Garth, still hale and hearty at eighty-two, ruled Garthmere Hall with a rod of iron. Until, that is, old Garth was found dead–'dead as mutton'–in the trampled mud of the ancient outhouse.

Glowering clouds gather over the dramatic dales and fells as seasoned investigator Chief Inspector Macdonald arrives in the north country. Awaiting him are the reticent Garths and their guarded neighbours of the Lune Valley—and a battle of wits to unearth their murderous secrets!