An island of our own - Sally Nicholls

From one of the brightest talents in children's fiction and the winner
of the Waterstones Children's Book prize comes a new novel
about family and friendship.
Siblings Jonathan, Holly and Davy have been struggling to survive
since the death of their mother, and are determined to avoid being
taken into care. When the family's wealthy but eccentric Great-Aunt
Irene has a stroke, they go to visit her. Unable to speak or
write, she gives Holly some photographs that might lead them to
an inheritance that could solve all their problems. But they're
not the only ones after the treasure...