This is a delightful Thorndyke mystery full of suspicious happenings, like the ugly human head found in a box checked at a railway station cloakroom. Other peculiar things are afoot too. A rich American gentleman has come to London to make a claim for an earldom, based on some far-fetched evidence. His lawyers seem particularly unsavory. And theres been a daring robbery of precious platinum, with a British vessel somehow implicated. The plot evolves around all these suspicious goings-on. It takes the clever Dr. Thorndyke to discover how they interrelate. The good doctor must solve these seemingly unrelated cases using his usual bag of forensic tricks and a few new ones for good measure. The crooks involved are unusually clever, but as usual, justice is served when... Dr. Thorndyke Intervenes!