Flyaway - Lucy Christopher

In this touching novel for ages 10+, Lucy Christopher explores the
remarkable bond between a young girl, a boy and a damaged wild
bird - a relationship that will touch everyone who reads it. While
visiting her father in hospital, thirteen-year-old Isla meets Harry,
the first boy to understand her and her love of the outdoors.
But Harry is ill, and as his health fails, Isla is determined
to help him in the only way she knows how. Together they watch a
lone swan struggling to fly on the lake outside Harry's window. Isla
believes that if she can help the damaged swan, somehow she can
help Harry. And in doing so, she embarks upon a breathtakingly
magical journey of her own.