The Shifter Series 1 includes the books "The Portable Door" and "The Last Kids on Earth", both written in English by various authors. The series follows a group of kids as they navigate a post-apocalyptic world filled with monsters and challenges. With engaging storytelling and diverse voices, this series is sure to captivate young readers and transport them to a thrilling and imaginative realm. Perfect for those who enjoy action-packed adventures and supernatural thrills.