The Brighton brothers hunt monsters. They formed Purple Squirrel Investigations, an organization dedicated to finding and protecting cryptozoological animals. Book 1: David Brighton travels to Ohio to rid a farmer of a pest that has been eating his livestock. The pest just happens to be an enormous dragon. Will David survive this latest mission? Book 2: Seth Brighton, on vacation in Tombstone, Nevada, encounters what can only be described as a pterodactyl. After having his car for supper, the beast sets its sights on Seth next. With only his intellect and what's available to him in the desert, Seth is in for the fight of his life! Book 3: Something in a small town's bay is scaring away all the fish... Something big.Jonah Brighton is called to investigate a California coastal town where he must use his inventing expertise to find and rid the town of the creature. But he is given only 24 hours before the angry townspeople will take lethal matters in their own hands. In a desperate attempt to find the mysterious animal, Jonah finds both his and the creature's lives are at stake. Book 4: "Violets are blue, roses are red. Give me the codes or your brothers are dead." This note greets Nathan Brighton when he enters the smashed offices of Purple Squirrel Investigations, an agency he and his brothers run that specializes in protecting, finding and extracting cryptozoological beasts so they can live out of harm's way. Phineas Ravenstein, their bitter rival, has somehow broken out of prison and is now demanding access codes to Gauntlet Bay, their secret island animal preserve, by kidnapping Nathan's brothers as hostages. His intent? Revenge and the pillaging of all the animals from the island. It's up to Nathan, the youngest and least experienced in the field, to find his brothers before it's too late.