It is the summer of 1810. The Lyon family of London is eagerly preparing for the wedding of their eldest daughter Hannah. But as the women bustle from the dressmaker to the haberdasher, Mr. Samuel Lyon, a well-respected clockmaker and member of London’s Jewish elite, suffers a crushing blow when his entire fortune is lost. The Lyons are on the verge of despair when help arrives from an unexpected source: Mr. Ezra Melamed, wealthy widower and benefactor of London’s Jewish community. Anxious to help Mr. Lyon recover his fortune, Mr. Melamed goes beyond London’s fashionable streets to search for clues in that city's darkest places. But with only a key, a button, and a few cryptic words from a Chassidic Rebbe to guide him, can Mr. Melamed restore the disappearing dowry to its rightful owners...before the Lyon family faces total ruin?