When the mayor tells the Dinomighties that there's been a theft of famous purple beans at the How You've Bean factory, they are hot on the trail. Using their peak investigative skills to hunt down crime clues and interrogate potential suspects, they soon run out of gas and into airtight alibis. A look to the nemesis list points squarely to the gaseous Gasosaurus, but the Dinomighties need proof before they can pin down this baddie. In their grimiest case yet, T-Lex, Teri, Dave, and Bok follow their noses to sniff out and solve this musty mystery with high-tech crime-solving gadgets, action-packed chases, bad-guy-busting buddy power, and a whole lot of laughs.