When Luke and his sister Charlotte discover a hidden trapdoor in the shed in their grandparents' backyard, they uncover a secret world deep below-an underground station filled with talking, purring cat-trains, and no end to new adventures!When Luke's silver compass begins to pulse again, he knows it can only mean one thing-another adventure! This time, it leads Luke and his sister Charlotte far from home to the sun-soaked hills and sparkling rivers of Arkansas. Joined by their new friend Whit, they dive into a world of mystery, friendship, and discovery-where hidden doors, magical trains, and southern landscapes come to life. Luke and Charlotte and the Arkansas Adventure is a heartwarming journey of courage, imagination, and the unbreakable bond between brother and sister.Discover the power of imagination, teamwork, and kindness in this book of the Cat-train Adventures series-a magical world waiting just beneath your feet.