I yawned, rolling onto my other side and reaching across the sheets, expecting my hand to meet the warm, solid frame of Sullivan's body.

Instead, the mattress beside me was empty and cold.

I lifted my head, my eyes adjusting to the shadowy dark of the master suite. He was standing by the floor-to-ceiling windows, his broad shoulders and towering silhouette casting a long, commanding shadow across the hardwood floor. His back was turned to me, his stance rigid as he stared out into the grounds below, buried deep in his own thoughts.

What is going through that terrifying head of his? I wondered, resting my chin against the pillow,...