Saul Imbierowicz had led a very unremarkable life until he was murdered by Al Capone and was then reborn as a vampire. Now Saul works for Eliot Ness, trying to take down Chicago’s most dangerous gangster. But only Saul, Ness, and Saul’s new partner, Agent Christian Wright, know the true danger that Capone represents.

As a vampire, Saul is stronger, faster, and his wounds heal rapidly, but he is also constantly fatigued, and he has a million questions about his new “life”. An offer from Al Capone to answer these questions comes with a price that Saul is unwilling to pay and, when the mysterious Mr. Brown reappears, Saul learns that there is a war brewing that will put any spat between human gangsters to shame.

While Saul struggles to keep himself from becoming a monster like Capone, he and Christian must work together, a task which is easier said than done. Christian sees Saul as an abomination, an affront to God, and would rather stake Saul than work with him, but understands that a war between vampires would be disastrous. This fledgling partnership must succeed, or Chicago may pay the price of its failure.