The Left Leg is a novel that was published in 1940 by Phoebe Atwood Taylor writing as Alice Tilton.

Potter is inclined to be helpful, until the Wimpernel's purse is discovered in Witherall's pocket and Witherall is incautious enough to admit that he saw Potter's cash register being emptied by a man in a green satin suit carrying a small harp.

He heads for the home of a former teaching colleague, Marcus Meredith, and finds him murdered—and missing his artificial left leg.

Potter is enlisted by Witherall for help in solving the murder, along with intrepid housewife Topsey Beaton.

Together they deceive an entire rummage sale, enlist the Scarlet Wimpernel to play a role, find the man in green satin, locate the left leg, and solve the murder.