Woman falls from window of flat. Doctor says killed instantly. Well, thought Ludovic Travers as he set the newspaper aside, that finally put a period to a highly unsuccessful case. The woman, a Mrs. Strand, had seemed a bit deranged when she came to him for help in locating some missing friends, but he quest led to a dead end. So Travers turns to the infinitely more challenging new mystery of the missing diamonds- 50,000 of them, stolen...