London, 1888...A clairvoyant has envisioned two men as potentially being Jack the Ripper. She hires The Zane Brothers Detective Agency to determine which man is threatening her. While investigating her case, the brothers are also searching for a missing woman who has stolen a valuable necklace. Oddly, the two cases intersect, making both investigations mysteriously perplexing. And, Evan Zane finds the clairvoyant's niece Alexia equally mystifying.