Ever since Viola’s boyfriend broke up with her, she has spent her days silently wishing—to have someone love her again and, more importantly, to belong again—until one day she inadvertently summons a young genie out of his world and into her own. He will remain until she makes three wishes.

Jinn is anxious to return home, but Viola is terrified of wishing, afraid she will not wish for the right thing, the thing that will make her truly happy. As the two spend time together, the lines between...