Do you know your dinosaurs? Dan does. He & his dog Bouncer are digging down to see if they can find the Tyrannosaurus Rex that could swallow a boy in just two bites the gigantic Brachiosaurus that was taller than the tallest trees & the Coelophysis that had knife sharp teeth & sometimes ate its own young. Dan finds a pin & a scrunched up tin & an old plate & a key to a gate & a stone that looks like an odd sort of bone. He doesn't think anything of the odd shaped stone until his mum drags him to the museum (which he's sure is going to be boring & musty) where he spies that the awesome Ty Rex skeleton has a tooth missing
- just like Dan! He knows that dinosaurs grew new teeth when the old ones got broken...and the tooth gap looks just the right shape & size for it to be...the odd shaped stone!