He gave me an arch look as if to say he sure couldn’t get anything by me. “The essential spark isn’t easy to pin down in terms of your DNA,” he told me. “It’s an openness to the other world. Some humans literally can’t believe there are creatures in another world besides ours, creatures who have feelings and rights and beliefs and deserve to live their own lives. Humans who are born with the essential spark are born to experience or perform something wonderful, something amazing.”

I’d done something pretty amazing the night before, but it surely wasn’t wonderful . . . unless you hated vampires.

“Gran had the essential spark,” I said suddenly. “So Fintan thought he’d find it in one of us.”

“Yes, though of course he never wanted me to give her my gift.” Mr. Cataliades looked wistfully at the refrigerator, and I got up to make him another ham sandwich. This time I sliced some fresh tomato and put it on a little plate, and he piled every single bit on the sandwich and still managed to eat it neatly. Now that was supernatural.

When he’d finished half the sandwich, Mr. Cataliades paused to say, “Fintan loved humans, and he especially loved human women, and he even more greatly loved human women with the essential spark. They aren’t easy to find. He adored Adele so much that he put the portal in the woods so he could visit her more easily, and I’m afraid he was mischievous enough to . . .”

And it was Mr. Cataliades’s turn to stop and look at me uneasily, weighing his words.

“He took my grandfather for a test drive every now and then,” I said. “Dermot recognized Fintan in some of the family pictures.”

“I’m afraid that was very naughty of him.”

“Yes,” I said heavily. “It was very naughty.”

“He had great hopes when your father was born, and I was here the day after to inspect him, but he was quite normal, though of course attractive and magnetic, as those who are part fae are. Linda, the second child, was, too. And I’m sorry about the cancer; that shouldn’t have happened. I blame it on the environment. She should have been perfectly healthy all her life. Your father would have been, if the terrible infighting hadn’t broken out among the fairies. Perhaps if Fintan had survived, Linda’s health would have stayed with her.” Mr. Cataliades shrugged. “Adele tried to reach Fintan to ask if there was anything he could do for Linda, but by then he had passed away.”

“I wonder why she didn’t use the cluviel dor to cure Aunt Linda’s cancer.”