No Less in Blood — D.M. Pirrone

In 1893, seventeen-year-old Mary Anne Schlegel left her uncle's Chicago home to visit the World's Fair and vanished. The discovery of her fate more than a century later upends the life of Rachel Connolly, an adoptee desperately seeking her roots. Rachel's search for her birth mother leads her deep into a shrouded family past and threatens to uncover a secret kept for three generations… a secret one of her newfound kin just might be willing to kill for.