The Mystery of the Amber Beads (S2E12): After the strangulation of a rich widow, her necklace turns up in a pawnshop run by a young gypsy woman named Hagar. The police quickly zero in on a chief suspect, but Hagar has other ideas about the culprit. However, sometimes even her instincts can let her down. It features Sara Kestelman, Joss Ackland, Stephan Chase, and Kathleen Byron. The Rivals of Sherlock Holmes is a British television anthology mystery drama series, which originally aired between 1971 and 1973. Adaptations of mystery stories written by Sir Arthur Conan Doyle's contemporary rivals in the genre.