This is set about 4 years after the eruption of Vesuvius at the end of Cambridge Latin Course 1. Clemens, now that he is a free man, has built up a new life. He has a wife (Cornelia) and they have a baby (Gaius). But as wonderful as his new life may be, his past still haunts him in his dreams.
(Wow this makes it sound way more dramatic than it actually is)