All Of Us Murderers

"When Zeb Wyckham is summoned to a wealthy relative's remote Gothic house on Dartmoor, he finds all the people he least wants to see in the world - his estranged brother, his loathsome cousins, and his bitter ex-lover, Gideon Grey. Nothing, he is certain, could possibly be worse. Then the grizzled old patriarch announces the true purpose of the gathering: He intends to leave the vast family fortune to whichever of the men marries Cousin Jessamine...