The Ancient Castle: Lumen Epic Fantasy Series Book I    

Scott Frontier's first year at his new school was supposed to be a normal school year. But when he unexpectedly runs into a mysterious girl, he finds himself suddenly transported to her world where the myths and legends of his world are the realities of her's. And when she suddenly disappears, he must navigate a strange world he knows nothing about in order to save her.

No bad language. This book is clean and entertaining. It is an epic fantasy / adventure book suited for all ages.