"When pterodactyls swoop down on opening day of the end-of-summer carnival in Trihorn Settlement, carrying away Terrordactyl Bill, Josh and his friends head to Rocktooth Ridge to rescue their hero"--Provided by publisher.
While the sheriff is away, crooked, businessman Malachi Wilks and his stegosaurus workers try to build a railroad through Trihorn Valley, with only Josh and his friends standing in his way.
Josh, Abi, and Sam are working the annual iguanodon drive when an avalanche traps them with their arch-nemesis, Amos, and the only way out is through the infamous Roaring Jaws Valley.
Josh is determined to capture the Blood Claw Bandit and use the reward money to help fix his family's ranch, especially after Josh's beloved triceratops, Charge, is stolen.
With the help of his friends, Sam and Abi, and his trusty Dino Cowboy Diary, Josh dreams of roping a wild Triceratops and maybe become the next great Dino Rider.
After recording the facts in his Dino Cowboy Diary about the biggest dinosaur in existence, Josh brings his friends Sam and Abi along on his mission to capture one.
