September AD 81. Flavia and her friends learn of the mysterious and sudden death of the Emperor Titus. Was his death natural? Or was it murder? As the four detectives investigate this mystery, they little dream how much their lives - as well as the future of Italy - will be changed as a result.

Flavia and her friends are on a quest for the Emperor Titus - to steal a valuable gemstone known as 'Nero's Eye'. The Delphic Oracle prophesied that whoever owns the gem will rule Rome - so Titus is determined to claim it for himself. Their travels take them across the Roman province of Mauretania, from Sabratha (in modern Libya) to Volubilis (Morocco). As they travel on a caravan across the desert they encounter slave-traders, pantomime actors and a wild animal stampede. The detectives must consider another quest: what has happened to Uncle Gaius? Meanwhile, Flavia faces some tough decisions about her future.

Flavia and her friends return to Rome from Ephesus in the year 81, and when they learn about the mysterious death of Emperor Titus, they investigate, leading to many changes for Italia and for themselves.

Mystery and adventure for four young detectives in Ancient Roman times... It's summer in the Bay of Naples - time for fun and relaxation. Everyone is thinking about love at the beautiful Villa Limona, but danger lurks beneath the luxury. A famous murder was committed nearby, and a poisoner is at large amongst the guests. Can Flavia and her friends set a trap to catch the culprit before it's too late?

Jonathan goes on a secret quest to Rome, and Flavia, Nubia and Lupus set out to find him. Their dangerous mission takes them to the Golden House of Nero where a deadly assassin is rumoured to be at work - and they learn what happened to Jonathan's family during the terrible destruction of Jerusalem nine years earlier.

It's August, AD 81. Presumed dead by their families but wanted by unknown authorities, Flavia and her friends feel very far from home. When news of more kidnappings reach them, and they discover that one of Miriam's twins is among the missing, the four detectives set out for Halicarnassus to help. Here they find the countryside is full of prophets who heal the sick and cure the lame - or are they merely tricksters and villains in disguise?

A desperate quest begins in the port of Alexandria: site of the great lighthouse, the famous Library, and the tomb of Alexander the Great. Codes, riddles, anagrams and hieroglyphics lead the young detectives down the river Nile to pyramids and sphinxes, temples and tombs, crocodiles and hippos. But what lies at the end of the journey? Treasure? Or death?

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Jonathan's father, Doctor Mordecai, is summoned to Rome to help the plague victims. The four young detectives are wanted too, as the Emperor Titus believes that they can find the mysterious enemy who seeks Rome's destruction. Can the friends prevent disaster? And what is Jonathan's secret mission?