Based on the works of Victorian-era mystery writers, this classic British series spotlights ingenious sleuths who match wits with international jewel thieves, assassins, counterfeiters and various swindlers of all sorts. Their cases take them around the world, from London to South Africa, France and even across the Atlantic aboard a steamship. Noteworthy actors making appearances in these episodes include Derek Jacobi, Judy Geeson and Jean Marsh.