001 Double Crossing
001 Extreme Danger
001 Secret of the Red Arrow
001 Terror on Tour
001 The Gross Ghost Mystery
001 The Secret of the Knight’s Sword
001 The Tower Treasure
001 Trouble at the Arcade
In Trouble at the Arcade, nine-year-old Frank and eight-year-old Joe Hardy discover trouble lurking at the local arcade and decide they make pretty good detectives—just like their dad!
001 Wanted
002 A Crime for Christmas
002 Danger on Ice
002 Danger Overseas
002 Kidnapped at the Casino
002 Mystery of the Phantom Heist
002 Running On Fumes
002 The House on the Cliff
002 The Karate Clue
002 The Missing Mitt
In The Missing Mitt, the boys must help their teammate find his lucky mitt before the last game, or their Little League season is doomed!
003 Boardwalk Bust
003 Club Dread
003 First Day, Worst Day
003 Mystery Map
In Mystery Map, nine-year-old Frank and eight-year-old Joe Hardy get their hands on a piece of a treasure map. But they’ll need to work with their friends and hunt down the rest of the map in order to have a chance at finding the treasure.
003 Shock Waves
003 The Feathered Serpent
003 The Secret of the Old Mill
003 The Vanishing Game
004 Dangerous Games
004 Gold Medal Murder
004 Hopping Mad
In Hopping Mad, the boys have to figure out a way to stop their school talent show from being ruined—by raining frogs!
004 Jump-Shot Detectives
004 Secret Cargo
004 The Missing Chums
005 A Monster of a Mystery
When the actor who plays popular comic character Morpho the Morph Monster comes to town for a fan day—along with his famous Morpho Mask and Morph Spork—everyone, including Frank and Joe, is excited to meet the man behind the mask. But at the event, Morpho’s Spork goes missing! And until the Spork is returned, the entire event will be put on hold! It’s up to Frank and Joe to crack the case—and return the Spork to its rightful owner!