In the wilds of Manhattan are four wealthy women — all heiresses to the sizable Saybrook diamond fortune. When their grandfather returned from World War II with a rare, valuable gem, he couldn’t have known how his empire would expand . . . or how his granddaughters would someday work to either protect or squander it.

Corinne, Poppy, Aster, Natasha and Rowan are differing cousins with one major bond: the Saybrook name. Though Natasha has renounced her claim to the family fortune, the others spin around the sphere of the successful jewelry company with varying definitions of success. But when tragedy strikes, grievances are aired — and it’s obvious not everyone thinks the Saybrooks walk on water. In fact, someone wants to bring them all down.

Sara Shepard’s The Heiresses is fast-paced rich-people voyeurism at its finest. Manhattan addresses, fancy clothing, scandal, intrigue, mystery . . . and death. It’s…