midnight
`` Very good . Now , one of these Indians will be here to-morrow night . We shall leave to-morrow morning ; and I do not want you to be rescued till after our departure . At midnight , to-morrow , then , the Indian will be here . He will give a sound like a frog , immediately outside , under the window . You must then open the window . If you see him , or hear him , you must then get out , and he will take you to the woods .