The Roman Mysteries is a series of historical novels for children by Caroline Lawrence. The books take place in the ancient Roman Empire during the reign of the Emperor Titus. They detail the adventures of four children who solve mysteries and have adventures in Ostia Antica, Rome, Greece, and beyond: Flavia, a Roman girl who lives in Ostia; Nubia, a slave girl from Africa; Jonathan, a Jewish boy; and Lupus, a mute beggar boy.