Contents: Object lesson / by Ellery Queen The green-and-gold string / by Philip MacDonald The adventurous exploit of the cave of Ali Baba / by Dorothy L. Sayers A window for death / by Rex Stout The case of the perfect maid / by Agatha Christie The convenient monster / by Leslie Charteris The case of the old man in the window / by Margery Allingham Handcuffs don't hold ghosts / by Manning Coles The case of the crying swallow / by Erle Stanley Gardner The little dog / by H.C. Bailey. Illustrated by Harvey Kidder.