Who has kidnapped their teacher? Another case for the young detectives Cornelia & Co.

In the age of Caesar's Rome, Cornelia and her friends Titus, Publius and Gaius, have arrived on the dot for today's lesson. But something is wrong - their teacher, Marcus Antonius, isn't here.

Rome, 46 B.C.: Caesar arranges for the defeated Prince of the Celts to be paraded in triumph through the town - and with him, the legendary Celtic gold! It goes without saying that Cornelia and her friends Titus, Gaius and Publius are there in the midst of the crowd, enjoying the spectacle.

Rome at the time of Caesar: when the four children Cornelia, Titus, Gaius and Publius dig up an old amphora they find in the mud of the Tiber, they are quite sure it must be hidden pirates' treasure. But the amphora contains neither gold nor precious stones, instead there's a ...