Books in this series

• #1 The Case of Hermie the Missing Hamster
• #2 The Case of the Christmas Snowm
• #3 The Case of the Secret Valentine
• #4 The Case of the Spooky Sleepover
• #5 The Case of the Stolen Baseball Cards
• #6 The Case of the Mummy Mystery
• #7 The Case of the Runaway Dog
• #8 The Case of the Great Sled Race
• #9 The Case of the Stinky Science Project
• #10 The Case of the Ghostwriter
• #11 The Case of the Marshmallow Monster
• #12 The Case of the Class Clown
• #13 The Case of the Detective in Disguise
• #14 The Case of the Bicycle Bandit
• #15 The Case of the Haunted Scarecrow
• #16 The Case of the Sneaker Sneak
• #17 The Case of the Disappearing Dinosaur
• #18 The Case of the Bear Scare
• #19 The Case of the Golden Key
• #20 The Case of the Race Against Time
• #21 The Case of the Rainy-Day Mystery
• #22 The Case of the Best Pet Ever
• #23 The Case of the Perfect Prank
• #24 The Case of the Glow-in-the-dark Ghost
• #25 The Case of the Vanishing Painting
• #26 The Case of the Double-Trouble Detective
• #27 The Case of the Frog-jumping Contest
• #28 The Case of the Food Fight
• #29 The Case of the Snowboarding Superstar
• #30 The Case of the Kidnapped Candy
• #31 The Case of the Spoiled Rotten Spy
• #32 The Case of the Groaning Ghost

Super Specials and Others

• Jigsaw Jones Super Special #1: The Case of the Buried Treasure

• Jigsaw Jones Super Special #2: The Case of the Million Dollar My$tery
• Jigsaw Jones Super Special #3: The Case of the Missing Falcon
• Jigsaw Jones Super Special #4: The Case of the Santa Claus Mystery
• Jigsaw Jones Super Special #5: The Case of the Four-Leaf Clover
• Jigsaw Jones Super Special #6: The Case of the Wild Turkey Chase
• Jigsaw Jones Detective Tips

Characters

• Jigsaw Jones (real name Theodore Jones) is the main character of the series. He once claimed that he himself was the first detective in the whole second grade.
• Mila Yeh is the partner of Jigsaw and his best friend.

Room 201

• Bigs Maloney is one of the class's nicest people and the toughest and the strongest in second grade.
• Miss Gleason, the class teacher
• Lucy Hiller, student in Jigsaw's class
• Bobby Solofsky, a competing detective who usually portrayed as somewhat as a rival to Theodore.
• Jasper Noonan, his nickname is Stringbean because he is as thin as a noodle.
• Timothy O'Brien, they called him Wingnut because his ears were three sizes too big for his head.

Grade 5 Buddies

• Ben Ewing, Jigsaw's buddy
• Jimmy the Weasel
• Rajib Manna
• Henry Sosa
• Scooby Wendell
• Bobby-Sue Black
• Babs Barbo
• Silu Chang
• Kelsey Saperstein

Jigsaw's Family

• Jigsaw's dad, who was a detective when he was in Grade 2, and studied in the same room (Room 201) as Jigsaw.
• Mom, came from Hackensack, New Jersey
  Hackensack, New Jersey
  Hackensack is a city in Bergen County, New Jersey, United States and the county seat of Bergen County. Although informally called Hackensack, it was officially named New Barbadoes Township until 1921. As of the 2010 United States Census, the city population was 43,010....
  
  , hate the words "hate" and "dumb".
• Billy, Daniel and Nick, brothers of Jigsaw
• Hillary, Jigsaw's sister
• Rags, Jigsaw's dog
• Grams

Others

• Mike and Mary, owner of Our Daily Bread and Pita brownies shop near the school, and family friends of the Jones.
• Marc (Red Cap), a teenager who lives near Our Bread and Pita, friend of Jigsaw, Mike and Mary.
• Reginard Armitage Pinkerton III, the richest kid of the town.
• Chase Jackson, the star of the TV show Spy guy and Jigsaw's friend. Chase appeared in the book #31 The Case of the Spoiled Rotten Spy"