Secret Seven Triple: "Secret Seven on the Trail", "Go Ahead, Secret Seven", "Good Work, Secret Seven"

Name: Secret Seven Triple: "Secret Seven on the Trail", "Go Ahead, Secret Seven", "Good Work, Secret Seven"
Author: /author/%D0%AD%D0%BD%D0%B8%D0%B4_%D0%9C%D1%8D%D1%80%D0%B8_%D0%91%D0%BB%D0%B0%D0%B9%D1%82%D0%BE%D0%BD_(Five_on_a_Treasure_Island)