This book starts a new storyline for Professor Sarantos and his students as they get transported back in time. Sarantos moves through this book with a unique emotional slant while trapped in an unknown, prehistoric adventure. The key to survival is delicate and they are all on edge. A fantastic journey awaits Sarantos and his students with some interesting plot twists. This book offers tantalizing battles scenes and its surprise twist ending will shock you to your core. The riveting characters in this book come to life and their character development will have you hopelessly hanging on as the reader tries to keep up with the many moving parts. Will the mission succeed? A world of secrets is revealed page after page. Will you dare to solve the mysteries that await? Will you take the plunge and ride this wave of adventure? Read Cross That Line with your eyes and heart wide open. You'll feel the intrigue guide you as you leave behind this world and glide towards the past...