The Highwayman — Michele Hauf

Max Fitzroy, the legendary Highwayman, had slain scores of demons with a razorlike whip and a burning need for revenge. Now, to rid himself of the demon inside him--who'd cursed him with immortality and stolen all sensual pleasures--Max needed a witch's familiar, the one creature he'd made a career of killing.

But the Highwayman wasn't prepared for the familiar named Aby. The sleek and sexy conduit to the demon world saw past his swirling shadow as easily as he scaled the walls she'd erected to protect herself. Max needed Aby to grant him his freedom, and then he needed to slay her. But how could he destroy the only creature he'd desired in centuries?