This book is the story of the Emperor Nero, his double Callistus, Callistus' brother Galen, and what might have happened if the Emperor Nero hadn't died in a ditch outside Rome. Despite some historical innacuracy, the book manages to evoke a dusty, raucous, long-ago time with great warmth and feeling. Told from the first-person perspective of Galen, I found the style to be a little grating initially, as the guy basically never shuts up. However, as the book progresses, the story really starts to flow; the humour and wit is everything you would expect from a Tom Holt novel, but the characterisation goes somewhat deeper, to great effect.
The plot lurches from one outrageous scam to another, with the "heroes" dogged by their own sheer stupidity, until you wonder how they can possibly blag their way out of yet another certain death situation. I spent most of the book wanting to give Nero a good sharp kick, and there were several scenes which caused me to laugh out loud (to the consternation of fellow train passengers). I thought the ending was very clever, it tied up enough loose ends to be neatish, without being an audience pleaser.