I am a sucker for a soppy, romantic time-travel story. In this case, linguist Kate Tannhauser is one of the members of a team that’s assembled to deal with the arrival of a man who can be nothing but Prince Madoc of Gwynedd—a twelfth-century Welsh seafarer who seems to be skipping through time at 75-year intervals—and Kate intends to be with him on the next skip.