It was Brutus' close links to Caesar which had helped Fabiola to make the final decision. Had it been her gut instinct? To this day, Fabiola was not sure. Thankfully, her gamble on Brutus as the best candidate had paid off richly. Five years before, he had bought her from the brothel, establishing her as the mistress of his new latifundium, or estate, near Pompeii.

The property's former owner had been no less than Gemellus! Fabiola's lips curved upwards in triumph. To this day, knowing he'd been ruined felt like sweet revenge. Not that she'd pass up an opportunity to kill the whoreson if she got a chance. Several attempts to locate him had failed miserably and, like much of Fabiola's past, Gemellus had faded into obscurity. She still had vivid memories of her short stay on his former latifundium, though. Fabiola's guts twisted with fear, and she looked up and down the road.

This close to the city, other travellers were plentiful, moving in both directions. Traders pulled along mules laden with goods; farmers headed for the busy markets. There were children herding goats and sheep to pasture, lepers hobbling on home-made crutches and demobbed veterans marching home together. An irritable-looking priest with a gaggle of shaven-headed acolytes in tow stalked past, lecturing on some religious point. A line of slaves in neck chains miserably followed a muscular figure wearing a leather jerkin and carrying a long-handled whip. Armed guards paced either side of the column, security against the captives' flight. The sight was unremarkable; after all, the need for slaves in Rome was huge. Nonetheless, Fabiola shrank back into the litter as it passed the shuffling, downcast men and women. Bile rose in her throat. More than four years later, the thought of Scaevola – a vicious slave catcher whom she had run afoul of – still terrified her.

She would not let it stop her, though.

Until she had seen Romulus in Alexandria, Fabiola's greatest discovery had been that Caesar was their father. Just once, she had been left alone with the general, who bore a striking resemblance to her brother. Seizing the opportunity, he had tried to rape her. It was not just the lustful look in Caesar's eyes that had convinced Fabiola of his guilt. His harsh words – 'Be quiet or I'll hurt you' – reverberated through her yet. Somehow, on hearing them, she had known he had used them before. With proof in her heart, she had waited and watched since. Her opportunity for revenge would come one day.

While Caesar might currently face the direst of threats in Alexandria, Fabiola did not want him to meet his end there. Dying at the hands of a foreign mob would frustrate her desire for an orchestrated revenge. Yet once Caesar was free to leave Egypt, more wars beckoned. In Africa and Hispania, Republican forces were still strong. Returning to Rome at this time provided Fabiola with the perfect opportunity to plot; to recruit the men who would kill Caesar if he returned. She would unearth plenty of conspirators by telling them, as she had told Brutus, how the general planned to become the new king of Rome.

The very idea of this was anathema to every living citizen. Brutus' domus was not the place to scheme, however; smiling, Fabiola trusted in the gods to help her find a better base.

Many weeks passed before Fabiola felt confident enough to venture out unaccompanied by Brutus. Entering Rome had brought back her fear of Scaevola with a vengeance. Sheer panic engulfed Fabiola if she went out alone. Consequently, she found herself content to stay in the domus. There was plenty to do: keeping the household in order; hosting feasts for Brutus' friends; and doing the lessons set her by the Greek tutor she had employed. Fabiola also learned to read and write, which boosted her confidence enormously. She devoured every manuscript she could lay her hands on. It was easy to understand why Jovina had kept her prostitutes illiterate, she realised. Ignorance kept them more malleable. Returning home exhausted every day, Brutus was impressed by her probing questions about politics, philosophy and history.

Since delivering the news of Caesar's predicament to Marcus Antonius, Caesar's official deputy, Brutus had been engaged in running the Republic with Antonius and other main supporters of the dictator. There was to be no let-up either: Rome was more troubled than ever. Unsettled by the lack of information about Caesar – until Brutus' reappearance, his whereabouts had been unknown for more than three months – the populace had been demonstrating. Encouraged by a few power-hungry politicians, unhappy nobles who were heavily in debt were demanding total recompense from Caesar, making a mockery of his earlier law to partially abolish their liabilities. Dissatisfied, some had even declared for the Republicans. To make matters even worse, hundreds of veterans from Caesar's favourite legion, the Tenth, had been sent back to Italy and were adding to the unrest. Infuriated by the delay in providing their retirement settlements of money and land, they were demonstrating on a regular basis.

Marcus Antonius' response had been typically heavy-handed: troops were brought in to disperse the first sets of troublemakers, and soon after blood had been spilled on the streets. The treatment was reminiscent of that meted out to rebellious Gauls rather than to Roman citizens, Brutus ranted to Fabiola. While the issue of rebellion by Pompeian supporters had subsided, Antonius had done little to reassure the veterans. His token attempt at placation had backfired badly. More diplomatic by nature than the fiery Master of the Horse, Brutus had been to meet the Tenth's ringleaders, and had appeased them for the time being. Yet much remained to be done before the situation was stabilised.

By early summer, Fabiola was content that Brutus was occupied with other matters, and that there had been no sign of Scaevola. An outrageous idea had come to mind and she finally decided to visit the Lupanar, the brothel that had been her home during her prostitution. Brutus was to be left in the dark, though. For the moment, the less her lover knew, the better. Unfortunately, keeping her destination secret meant that none of Brutus' legionaries could escort her. Fear bubbled in Fabiola's throat at the thought of walking the streets accompanied only by Sextus, but she managed to quell it. She could not remain confined behind the house's thick walls for ever, nor did she wish always to rely on squads of soldiers to go out in the world.

Secrecy was paramount.

So, ignoring her servant Docilosa's pursed lips and the muttered complaints of the optio in charge of Brutus' men, she and Sextus headed out into the Palatine. The suburb was mostly inhabited by the wealthy but, like all parts of Rome, there were plenty of insulae, the tall wooden blocks of tenement flats in which the vast majority of the population lived. With open-fronted shops occupying the ground floors, the insulae were three, four and even five storeys high. Poorly lit, rat-infested, without sanitation and heated only by braziers, they were death-traps. Disease lurked within them, flaring into frequent outbreaks of cholera, dysentery or smallpox. It was commonplace too for insulae to collapse, or to go up in flames, burning to death all the inhabitants. Their close proximity to each other meant that little light penetrated down to the narrow, crowded and muddy streets. Only the largest thoroughfares in the capital were surfaced; even fewer were more than ten steps wide. All were thronged daily by citizens, traders, slaves and thieves, adding to the claustrophobic atmosphere.

A city-dweller from birth, Fabiola had grown to love the open spaces around her latifundium. She had assumed that she was still used to crowds – until she and Sextus had left the domus a hundred paces behind them. Hemmed in on all sides, an image of Scaevola instantly came to mind. Try as she might, Fabiola could not throw it off. Her feet began to drag and she fell behind.