Intriguing time-travel story where the traveller does not move in location, only in what he perceives. So as the main character moves around following people he sees from the 14th century, he may be crossing 20th century roads and risks being run over etc. Also, the 14th century people can't see him. He is just an observer (removes the "changing the past" paradox nicely). Good read, my only complaint being it's hard to keep the characters and their relationships straight--even with the family tree in the front of the book. Among the 24 characters from the 14th century, there are only 14 distinct first names.
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The House on the Strand