Sara isn't great with strangers: she has selective mutism, so being in a new place isn't always easy. Sara's little brother is born premature. He looks small and red, like a baby bird, so she calls him Birdy. Because she can't visit him often, she writes him letters about everything that's happened since he's been born--like how her mom and stepdad are sending her to Toronto to stay with her half-sister, Abby. And how Abby...