When twelve-year-old aspiring detective Myrtle Hardcastle learns her neighor in quiet Swinburne, England, a breeder of rare flowers, has died she is certain it was murder and that she must find the killer.

"When best friends Abbi and Skylar witness a clandestine meeting between a mysterious woman and someone in a dark van, they're thrilled. Finally, a mystery to spice up the summer! Who could these people be? Why are they meeting? Are they spies? Criminals? The two girls are determined to find out. But then a local woman goes missing and is found dead in the woods. And Abbi and Skylar realize that their detective work could hold the keys to solving...

When someone commits robbery and murder aboard the luxurious train on which Myrtle Hardcastle, her Aunt Helena, her governess Miss Judson, and cat Peony are traveling, Myrtle is determined to find the culprit.

When thirteen-year-old Logan and his family move into a run-down old house in rural Virginia, he discovers that a woman was murdered there and becomes involved with his neighbor Arthur in a dangerous investigation to try to uncover the killer.

Detectives' Row is full of talented investigators, but Toby Montrose isn't one of them. He's only an assistant at his uncle's detective agency, and he's not sure he's even very good at that. Toby's friend Ivy is the best sleuth around -- or at least she thinks so. They both see their chance to prove themselves when the famed Hugh Abernathy announces a contest to choose the World's Greatest Detective. But when what was supposed to be a game turns into...

Thirteen-year-olds Cooper Goodman and Justice and Liberty Gordon investigate the eccentric residents of Windy Bottom, Georgia, after the remains of Coop's long-missing grandmother are uncovered and his Gramps is the prime suspect.

Queenie the cat has a BIG problem. And for once, it's not the slobbery, overly-excited creature who also lives at Blackberry Hill Inn. Sweet Lady Emsworth, the neighbor's prize cow, has disappeared, meaning no morning cream for Queenie. And when Queenie's not happy, NO ONE is happy . . . Things aren't looking great for Arthur the dog, either. His beloved humans, twins Harmony and Bro, are distressed about the strange activity in their town. Mysterious...

Queenie is a cat, deeply aware of her own perfection, and Arthur is a dog who normally likes everyone (except Queenie who is devoted to making his life a misery), and they both live at the Blackberry Hill Inn in the Northeast in snow country with their human twins (Harmony and Bro), and Mom; but one winter's day an unpleasant and suspicious stranger comes to stay at the inn, and soon the twin's uncle is framed for murder--and Queenie and Arthur must...

"Samantha and Rachel used to be friends. But then Rachel betrayed Samantha . . . and Samantha decided to make her life a living nightmare. Then one day, Sam and Rachel found themselves in a fight by a lake. Samantha pushed Rachel . . . and watched as Rachel fell back. And back. Into the water. And gone. No way to save her. No way she could be alive. The next day, Rachel shows up to school as if nothing happened. And now she's the one who wants to...

"Myrtle Hardcastle's search for a missing heiress, presumed lost at sea, runs aground when a murder in plain sight has no apparent victim"--Provided by publisher.