Island of the Aunts (English, Paperback, Eva Ibbotson)

When the kindly old aunts decide that they need help caring for creatures who live on their hidden island, they know that adults can’t be trusted. What they need are a few special children who can keep a secret-a secret as big as a magical island. And what better way to get children who can keep really big secrets, than to kidnap them! (After all, some children just plain need to be kidnapped.) Don’t miss this wildly inventive and funny read from master storyteller Eva Ibbotson.
Source- Goodreads.com
E19