A sharp knock woke Katelina the next evening. Jorick stirred next to her and gave his customary morning gasp, like someone who'd forgotten to breathe all night. The rap repeated, then she heard footsteps patter down the corridor.

She threw the bedclothes back with the realization that the sun wasn't yet gone. Jorick told her vampires who didn't get enough sleep needed extra blood-

"It's a matter of minutes," Jorick replied. "Though I hope it's not a regular ...