Angleberger, Tom. Inspector Flytrap series
Hoping to become the greatest detective that ever grew, Inspector Flytrap, a Venus flytrap, and his assistant, Nina the Goat, investigate "big deal" mysteries at an art museum, a cookie shop, and a garden. J-M ANG

Butler, Dori Hilestad. The Buddy Files series
While searching for his mysteriously lost human family, Buddy the dog is adopted by another family and helps solve the mystery of their missing boy. J-M BUT

Butler, Dori Hilestad. King & Kayla series
A lovable dog helps his human girl solve everyday mysteries. E 428 BUT

Cronin, Doreen. The Chicken Squad series
These chicks are not your typical barnyard puffs of fluff, and they are not about to spend their days pecking chicken feed and chasing bugs. No sir, they're too busy solving mysteries and fighting crime. J-M CRO

Cushman, Doug. Inspector Hopper.
Inspector Hopper and his perpetually hungry assistant, McBugg, solve three mysteries for their insect friends. E 428 CUS  

Howe, James. Bud Barkin, Private Eye.
Howie the wirehaired dachshund tries his paw at writing a new kind of novel, a mystery in which he imagines himself as a private investigator and Delilah as the "mysterious dame." J-M HOW  

Kelly, David A. Ballpark Mysteries series
Cousins Mike and Kate explore the inner reaches of major league baseball parks while solving related mysteries.

Roy, Ron. A to Z Mysteries series
While visiting Wallis's castle, Dink and his friends investigate strange noises that lead them to a dangerous secret.  A to Z Mystery series J-M ROY  

Roy, Ron. Calendar Mysteries series
The younger siblings of the kid detectives in A to Z Mysteries get their own mysteries to solve. Missing dogs, anonymous valentines, stolen Easter Eggs and more! J-M ROB

Roy, Ron. Capital Mysteries series
K.C. Corcoran and Marshall Li live near the White House, are friends with the President of The United States: Zachary Thornton , and investigate mysteries in and around Washington DC. J-M ROY

Rylant, Cynthia. The High-Rise Private Eyes: The Case of the Fidgety Fox.
When the fluffy dice of Melvin the bus driver turn up missing, Bunny and Jack, two animal detectives, investigate the case. One in a series E 428 RYL  

Sharmat, Marjorie Weinman. Nate the Great series
Young Nate takes on the most pressing mysteries in his neighborhood.From finding a lost cat on Halloween, to a missing cookie recipe, no mystery is too big or too small for Nate and his dog, Sludge, to tackle. E 428 SHA  

Skofield, James. Detective Dinosaur series
Detective Dinosaur and Officer Pterodactyl are challenged to solve three cases when a hat is missing, a shoe squeaks, and a loud clanging comes from a dark alley at night. E 428 SKO  

Sobol, Donald J. Encyclopedia Brown series
Encyclopedia solves mysteries for the neighborhood kids through his detective agency. But his dad is also the chief of police, and every night, Encyclopedia helps him solve his most baffling crimes. J-M SOB

Stilton, Geronimo. Geronimo Stilton series
A best-selling author, Geronimo Stilton works as a journalist and editor for the fictional newspaper The Rodent's Gazette who would like nothing better than to live a quiet life, but he keeps getting involved in faraway adventures with his mouse family. J-M STI, J-PBK STI  

Venable, Colleen AF. Guinea PIG, Pet Shop Private Eye series
By day, Sasspants is your average book-loving, gizmo-inventing guinea pig. By night she solves pet shop mysteries with the help of her sidekick, Hamisher the hamster. J-GRAPHIC VEN

Warner, Gertrude Chandler. The Boxcar Children series
When four orphaned and homeless children come across an abandoned boxcar, they turn it into their home to avoid living with their grandfather, who they've never met. J-PBK WAR, J-M WAR