The Case of the Rolling Bones (Perry Mason Series #15)

Years ago Alden Leeds found a rich vein of gold in the Klondike. Now his greedy relatives fear he's planning to grow his fortune away on a gold-digging spouse, Emily Millicant. So to prevent the two from joining in holy matrimony, they commit their affluent kin to a sanitarium on a trumped-up charge.
Then Leeds escapes, only to end up in the company of Emily's blackmailing brother, John, a manufacturer of fixed dice, rolling bones that always come up seven. But when John is murdered, with …