Book Series · 13 Books

Friday Barnes Books

In order from Girl Detective to In Plain Sight.

The Friday Barnes series is a set of 13 chapter books by R. A. Spratt, published between 2014 and 2025. Written for ages 8–12, most books run about 270 pages.

Girl Detective
Under Suspicion
Big Trouble
No Rules
The Plot Thickens
About the series

What's Friday Barnes About?

Thirteen funny middle-grade mysteries about an exceptionally clever girl detective solving crimes at school and around the world.

Where the story begins

First Book in the Series

Girl Detective
Sale price
$1398
Book #1 · Chapter Book · Ages 8–12 · 2014

Girl Detective

By R. A. Spratt, Phil Gosier (Illustrator)

A young detective uncovers mysteries at an elite boarding school, including a Yeti and a rival student.

288 pages
$14.99Save 7%
Paperback
Summary: Friday Barnes, an eleven-year-old genius, solves a bank robbery and enrolls at Highcrest Academy, only to find it teeming with mysteries. From vanishing homework to a swamp-dwelling Yeti, Friday's sleuthing skills are put to the test. But her biggest puzzle is Ian Wainscott, the charming yet antagonistic student who seems determined to thwart her. Can Friday unravel the secrets of Highcrest and uncover Ian's true motives? Dive into a world of intrigue and humor in this captivating mystery adventure.
In reading order

Friday Barnes Series

13 books · Published 2014–2025

#1
Girl Detective
#1 in Series
Sale price
$1398

Girl Detective

Chapter Book · Ages 8–12 · 2014

A young detective uncovers mysteries at an elite boarding school, including a Yeti and a rival student.

#2
Under Suspicion
#2 in Series
Sale price
$2089

Under Suspicion

Chapter Book · Ages 8–12 · 2015

Young detective must clear her name and solve new mysteries at school.

#3
Big Trouble
#3 in Series
Sale price
$1498

Big Trouble

Chapter Book · Ages 8–12 · 2015

A girl genius must solve her mother's kidnapping amidst school chaos.

#4
No Rules
#4 in Series
Sale price
$1348

No Rules

Chapter Book · Ages 8–12 · 2016

Chaos at Highcrest Academy: Can Friday solve the prank mystery and save the school?

#5
The Plot Thickens
#5 in Series
Sale price
$1348

The Plot Thickens

Chapter Book · Ages 9–11 · 2016

A young detective's truth-seeking risks friendships and uncovers school secrets.

#6
Danger Ahead
#6 in Series
Sale price
$1348

Danger Ahead

Chapter Book · Ages 9–11 · 2017

A school camp turns into a rescue mission and ghost hunt. Can Friday survive?

#7
Bitter Enemies
#7 in Series
Sale price
$958

Bitter Enemies

Chapter Book · Ages 8–11 · 2017

Chaos at Highcrest Academy: Can Friday Barnes solve the mystery amid mischief and mayhem?

#8
Never Fear
#8 in Series
Sale price
$1348

Never Fear

Chapter Book · Ages 8–11 · 2018

A genius student races against time to uncover hidden gold at her chaotic school.

#9
No Escape
#9 in Series
Sale price
$1348

No Escape

Chapter Book · Ages 9–11 · 2021

Ex-detective Friday faces art thieves in Italy, confronting her past and a charming nemesis.

#10
Undercover
#10 in Series
Sale price
$1597

Undercover

Chapter Book · 2022

A daring journey to Norway uncovers mysteries, court martial threats, and a polar bear attack. Can Friday solve it all?

Last Chance
Series
Sale price
$1299

Last Chance

Chapter Book · Ages 8–12 · 2023

A hidden letter reveals the Mona Lisa is a fake. Can Friday Barnes uncover the truth?

Collision Course
Series
Sale price
$1597

Collision Course

Chapter Book · Ages 8–12 · 2024
In Plain Sight
Series
0

In Plain Sight

Chapter Book · 2025
Good to know

Common Questions

How many books are in the Friday Barnes series?

There are 13 books in the Friday Barnes series. It began with Girl Detective in 2014, and the newest book, In Plain Sight, was published in 2025.

What order should you read the Friday Barnes books in?

Start with Girl Detective and follow the series order — the books above are numbered #1 through #13.

What ages are the Friday Barnes books best for?

The series is best for ages 8–12, based on the age ranges of the individual books.

The people

The Creatives Behind the Books

The people who bring Friday Barnes to life.

01

R. A. Spratt

Author
02

Phil Gosier

Illustrator
03

R. A. Spratt

Author

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