Abe is a loner. He's smart and creative, but just quiet. He likes a girl Mitzy and passes by her everyday after school, but never talks to her. On one afternoon he sees a sign he has never noticed before. Fortunes read. He goes to have his read and ends up travelling back to 1888 London as a jewelry apprentice. The next day Mitzy is transported as well. They have both been given tasks of preventing a murder and travelling on a boat. Jack-the-Ripper is on his killing spree and Jews are being blamed for it. Abe and Mitzy work together to figure out their tasks and try to get home.
Reminded me of The Devil's Arithmetic by Jane Yolen with the time travel back into the past. It is a quick read and keeps you going.