Best Crime and Mystery Series for ages 9 and 10

Murder Most Unladylike Mystery Series

Set in the 1930s in a quintessentially English boarding school, thirteen-year-old classmates Daisy and Hazel set up a secret detective agency at Deepdean School for Girls. Each book provides a fresh mystery for the friends to crack, full of twists, turns and red herrings. The girls solve crimes everywhere from the classroom to the theatre, becoming firm friends and overcoming the challenges of school life together, despite their different backgrounds.

Mysteries at Sea Series

Perfect for all readers aged 8 and above. Set your sails, for we've got some truly twisty and heart-pounding mysteries at sea to share. These books are set in the 1930s, aboard a ship sailing across the Atlantic. On this ship a sailor's daughter, Alice, meets a new friend, Sonny. Together, they will uncover a dark sabotage plot and investigate gold bars. And throughout the series they navigate waters time and time again on luxurious yachts, where more mysteries must be solved... 

Clem Fatale Series

Clem Fatal is a rollicking middle grade series full of madcap escapades, fast-talking dames and unlikely heroes, written by Eve Wersocki Morris with black-and-white illustrations throughout by Honie Beam. Meet Clem Fatale. Living in busy and bustling 1950s London, she is the youngest crook in the city. And together with her prisoner and/or sidekick Gilbert, Clem sets off on a number of adventures through the London underworld, dodging all kinds of danger and getting up to all sorts of trouble. 

Skulduggery Pleasant Series

The Skulduggery Pleasant books follow twelve-year-old Stephanie and Skulduggery Pleasant, a skeleton detective, as they as they explore the weird and wonderful magical underworld, fighting the evil forces threatening the world and trying to get justice for Stephanie's uncle’s death. 

Agent Zaiba Investigates Series

Each book in the detective mystery series follows main character Zaiba, her best friend Poppy and brother Ali as they get to the bottom of some very strange mysteries. From celebrity's missing dogs and teachers getting mysteriously poisoned to haunted houses and priceless lost artefacts, Zaiba solves any mystery that comes her way, like a true agent. 

Montgomery Bonbon Series

You've never met a detective like Bonnie Montgomery, a well-dressed gentleman detective who (apart from the hat and moustache) looks suspiciously like a 10-year-old girl. In each book, she's got a mystery to solve, from a highly suspicious death at the Hornville Museum to a mysterious death at Leerie Lighthouse... and more!

A High-Rise Mystery Series

Alice Eclair Series

Alice Eclaire is a true spy EXTRAORDINAIRE! Get ready to be whisked away on fabulous adventures, full of daring action and delicious cakes! Alice certainly leads an interesting life. By day she is a pastry chef, whipping up the loveliest sweets and treats! By night, her double life begins: she is a...SPY!

Scarlet and Ivy Series

Scarlet and Ivy is a fantastic middle-grade historical mystery series by Sophie Cleverly. These spine-tingling adventure stories are set in the 1930s at Rookwood School – a creepy boarding school with plenty of dark secrets – where twin sisters, troublesome Scarlet and quiet Ivy, investigate the disturbing mysteries that lurk behind closed doors. 

The Sinclair's Mysteries Series

Welcome to Sinclair's department store, where among the bonbons, hats and perfumes flying off the shelves, Miss Sophie Taylor and Miss Lilian Rose are set to solve some mysteries and crack impenetrable codes! All while devouring ice buns and munching on cucumber sandwiches, of course...