Only: The Last Dinosaur

When Mark and Deke found the big lizard at the construction site, they though they might have a Komodo dragon or maybe a big Gila monster. But the computer at the local library pointed them in a completely different direction. Now the boys must keep a secret as big as Only, the last dinosaur. Unfortunately, once word leaks out that there is a baby triceratops living and growing in their backyard shed, a dangerous situation quickly develops.