A wealthy young couple very much in love get married. Then she disappears on their wedding day.
She was an only child as her older brother disappeared at sea, and her twin sister was killed at age 5 in a fire at school. Lots of twists and turns, as well as a secret society, all show up during the search.
Green, as always, holds attention and carries the reader along. Anna Katharine Green Rohlfs (1846-1935) wrote detective fiction and was instrumental in helping shape the genre into its current form by introducing a series detective with an amateur sidekick, as well as a young girl detective.
