Visiting ​Grandma’s house ​in the mountain ​has always been ​fun. Upai can go ​camping with ​friends, having ​adventure in the ​forest sailing a ​boat in the ​river, and many ​more. But, this ​holiday he can’t​ do all that ​because the forest​ in the mountain ​is gone! What ​happens to the ​forest and what ​should Upai do? ​This book is in ​Indonesian and ​English.