All Colin Leffee wants is to be left alone: to run his used bookstore in peace, and to quietly drink himself to sleep every night in an attempt to drown out the memories of eight-hundred-plus years of existence.

Unfortunately, when a sullen teenage changeling is flung out of Faerie and onto his doorstep, the long-suffering, wayward son of Titania knows his dreams of solitude are dust. Colin—or Lord Coileán, as he is known to the Faerie court—must track down Meggy, the love of his life, and figure out how her child ended up in Titania's clutches to begin with.

But with family, it's never simple. He finds Meggy, only to see her yanked into Faerie—and the doors between the realms slammed and locked behind her. Now, it's not just her life at stake . . . but the fate of magic itself.

Always the loner, Colin reluctantly joins forces with an intensely stubborn wizard, a...