This is a story set in an alternate version of Earth where all the people have wings, whether bird wings or bat wings or insect wings. Bird wings are the rarest and usually come with other bird-like qualities such as raptor vision or clawed feet.
The main character of this story is Melany Walker, one of the few who have bird wings. Her best friend is Deena Marcet, who has Dragonfly wings and is obsessed with the theory that humans weren't always winged creatures... But that may not be just a theory. If people aren't supposed to have wings, why do they... And should they?