Beverley Miller has just started Gladknoll Secondary, but her thoughts are with Mitch and Mildred, the birds from the nearby osprey centre. She tracks them on the computer as they fly south for the winter. But the signals from Mildred's transmitter are not all they seem. What has happened to Mildred? With the unexpected help of her grandma, she sets out to solve the enigma. And so begins a life-changing adventure which leads to Africa and a meeting with the mysterious boy called Karim.