It is the eve of the Great War, and English chemist Lucilla Osbourne finds herself trapped on hostile German soil. Panicked and alone, she turns to a young Frenchman for shelter. Together they spend a night of intense passion, but their dangerous circumstances won't allow more than a brief affair.

Even with the memory of Lucilla's lushness ever present, scientist Pascal Fournier is distracted by his reason for being in enemy territory – Tanneken Claes has information Pascal could use against the enemy but, even more extraordinary…she's a werewolf.

After entrusting Pascal with her secret, Tanneken and her mate, Noel, are captured. Suspecting a rogue scientist rumored to have a fascination with werewolves is behind the abduction, Pascal knows he must act fast to save them. He's all too aware of Professor Kauz's reputed perversions and lust for control…

As war rages, Pascal and Lucilla combine efforts to stop Kauz, struggling with danger, power and secret desires transformed by the unyielding hunger for the beating of a lover's heart.