The Sunningdale Mystery: A Tommy & Tuppence Story (Tommy & Tuppence Mysteries)

Previously published in the print anthology Partners in Crime. Captain Sessle is found stabbed through the heart with a hatpin, and the only clue is a bit of red wool in his hand. A pretty blonde is charged because she was wearing a bright red wool coat, but the Beresfords aren’t so sure. Was there more behind the killing than a cute girl and some red yarn?