Proof of Murder

Bookshop owner Addie Greyborne must solve a locked-room murder in a supposedly haunted mansion to recover a priceless Sherlock Holmes original . . .
 
The seaside New England town of Greyborne Harbor is home to many grand estates, including the Queen Anne Victorian Addie inherited from her great aunt. Now one of those mansions is holding an estate sale, which is just what the bookshop owner needs ...