Â Â Â Â Â Â Â The
story is about Ollie, a young pigeon, who goes on a mission to find his sister
Piper. She is among the many missing pigeon children of London, and unimpressed
by the parentâ€™s efforts in finding them, he takes off on his own to find his
sister. What he discovers is that pigeon children are being hypnotized by the
evil raven king, Harmgrieve, in the Tower of London. Ollie meets a young
sparrow named Spencer, and together they combine their efforts to save Piper and the other pigeons.