Mummius was wrong to think that I would be bored with nothing to do on the Fury, at least as long as the sun was up. The ever-changing vista of the coast of Italy, the wheeling gulls overhead, the work of the sailors, the play of sunlight on water, the schools offish that darted below the surface, the crisp, tangy air of a day that was no longer summer but not quite autumn – all this was more than enough to occupy me until the sun went down.

Eco was even more entranced. Everything fascinated him. A pair of dolphins joined us at twilight and swam alongside the ship until long after darkness had fallen, darting in and out of the splashing wake. At times they seemed to laugh like men, and Eco mimicked the sound in return, as if he shared a secret language with them. When at last they disappeared beneath the foam and did not return, he went smiling to his bed and fell fast asleep.

I was not so lucky. Having slept most of the day, I faced a sleepless night. For a while the shadowy coast and the sparkle of stars on the water charmed me quite as much as had the luminous afternoon, but then the night grew colder, and I took to my bed. Marcus Mummius was right: the bed was too soft, or else the blanket was too rough, or the faint starlight through the porthole was too distracting, or the noises Eco made in his sleep, mimicking the dolphins' laughter, grated on my ears. I could not sleep.

Then I heard the drum. It came from somewhere below, a hollow, throbbing beat slower than my own pulse but just as steady. I had been so exhausted the night before that I had not heard it; now I found it impossible to ignore. It was the beat that drove the slaves at their oars below deck, setting the rhythm that carried the ship closer and closer to Baiae. The more I tried not to hear it, the louder it seemed to rise up through the planks, beating, beating, beating. The longer I tossed and turned, the further sleep seemed to recede.