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%98%D0%BD%D0%B8%D0%B4_%D0%91%D0%BB%D0%B0%D0%B9%D1%82%D1%8A%D0%BD_(Five_on_a_Treasure_Island)