Stiff Upper Lip, Jeeves by P. G. Wodehouse

Gussie Fink-Nottle must marry Madeleine Bassett or Bertie will be obliged to proffer the ring in his stead, so Jeeves and Bertie visit Totleigh Towers, a rural leper colony. It's suicide, but Gussie's engagement to that drip, Madeleine, must somehow be saved.