To London's aristocracy, the Inferno Club is a scandalous society of men no proper young lady would acknowledge. In private, they are warriors who would do anything to protect their king and country.

In the ultimate battle of good versus evil, the Order's shadow war against the Prometheans reaches a crescendo; Drake Parry, Earl of Westwood, plays out a deadly masquerade to bring down the conspirators' dark cult from the inside. But can the love of an innocent beauty save the tortured agent's soul, or will he be swallowed up by the darkness he came to destroy?