Elizabeth Daly 
Somewhere in the House [EPUB ebook] 

The Clayborn clan has been waiting 25 years to divvy up Grandmama’s fortune, locked up by her will and in a small room in the Clayborn mansion. Tomorrow The Room is to be opened, and the Clayborns can’t wait to get their fingers on the old lady’s reportedly priceless button collection. Harriet Clayborn, who doesn’t quite trust her family, asks Henry Gammadge to witness the Opening of The Room, to make sure there’s no funny business. Gammadge agrees, and it’s a good thing this masterful sleuth is on hand: the Room has been hiding something grislier than buttons.