The Chalmers Case

"Now that Janet and Joan Markham have had their first (albeit unexpected) guest, Joan is eager to get the bed and breakfast running properly. A shopping trip for some paintings to decorate the guest rooms leaves Janet convinced that William Chalmers, a man she doesn't like anyway, is up to no good.
When some of William's friends come to stay with the sisters, Janet's suspicions are heightened. A second set of guests keeps the women busy, but Janet can't help but wonder when the two couples become unlikely friends."