6 year old Hetty Feather and her little brother, Gideon are forced to leave their "borrowed" family and return to the Foundling Hospital which the fearsome Matron rules with an iron fist. When Hetty meets up with Mathias and the gang from the boys' wing they hatch a high risk plan to escape the hospital for good. Can they scale the walls in search of freedom or will the She-Mob and Matron catch and punish them?