Emma Streyt hated to admit she was bored. But her newly retired brother puts an end to that by dropping a stash of old family memorabilia on her doorstep. Cheered on by her best friend, Emma enthusiastically dives into these boxes of antique treasures. But some faded diary pages convince her that century-old jewel thefts- and maybe something worse-are tied in with their past. Eager to dig deeper into this mysterious puzzle by doing some serious research, she settles into a neglected New York City archive with an eccentric cast of characters. But more sinister matters than history soon unfold there when a fellow researcher is murdered. And Emma's determination to solve the case makes her a dead-center target for the killer.