Lily Watson meets the man of her dreams at a costume party on Halloween. After a night of passion, she wakes to discover that Nathan's costume is a reality. He wasn't just pretending to be a ghost. He is one.

After four years of wandering aimlessly without a soul able to see him, Nathan is shocked when sweet, enchanting Lily starts up a casual conversation with him at a party. Even more shocking, he's able to touch her. In a complex relationship between woman and ghost, the pair must wonder how long they'll be able to keep Lily's human friend from asking too many questions about the boyfriend she never sees. More worrisome, they must wonder how long Nathan will be permitted to live in the mortal world.