Det går et lys opp for Caius

The mischievous schoolboys of ancient Rome who were featured in Henry Winterfeld's Detectives in Togas this time find themselves involved in an assassination plot.Trouble begins when Mucius, Caius, Antonious, and four other young Romans give their schoolmaster, Xantippus, a present - a newly captured slave from Gaul named Udo - only to discover that Udo is carrying a secret message ordering the murder of a famous Roman senator. All seven of the boys are sons of famous senators, and so they set out to track down the assassins, blundering from one dangerous adventure to another until their bravery and the cool logic of Xantippus saves the day.