Secret Seven:

The second in Enid Blytonĺs classic adventure series! The Secret Seven are Peter and his sister Janet, Jack, Colin, George, Pam and Barbara. They meet every holiday in the shed at the bottom of Peter and Janetĺs garden, which can only be accessed by whispering a secret password. There, they solve puzzling mysteries and eat lots of delicious food! In their second mission, the Secret Seven witness a thief stealing a priceless pearl necklace. He gets away, but the gang are on the case. It will take all their cunning and teamwork to catch the culprit ľ but he is no match for these intrepid adventurers!