Under Tiberius is a thrilling story of crime and deceit involving the man who came to be called Jesus Christ. Deep in the recesses of the Vatican, Nick Tosches unearths a first-century memoir by Gaius Fulvius Falconius, foremost speechwriter for Emperor Tiberius. The codex is profound, proof of the existence of a Messiah who was anything but the one we've known - a shabby and licentious thief.
An aging New Yorker, a writer named Nick, feels life ebbing out of him. One night, at a dimly lit bar, he meets a tantalizing young woman, and the night that follows is the most extraordinary of his life. Propelled by uncontrollable, primordial desires, he tastes human blood for the first time and is filled with a sexual and spiritual ecstasy.
His revival quickly fades, and soon Nick is yearning for another taste of the elusive rapture.