- The Seven have a fantastic new hiding place, but someone else is using it too - and they"re sneaking there at night! The gang are annoyed; it"s their place, and they don"t want strangers there! They"re determined to catch the cheeky intruder out, and Jack"s little sister, Susie, proves to be more than just a mischief when she helps them finally get their hands on the culprit!