Book Series · 15 Books

The Questioneers Books

In order from Iggy Peck, Architect to What's That Color?.

Andrea Beaty and David Roberts's young creators ask big questions, learn from mistakes, and combine science, design, art, and teamwork to solve problems in their community.

Reviewed by the Bookroo Editors Updated August 12, 2026

Reading order

How to Read the Questioneers Books

This page shows the 15 core books in publication order: seven picture books, seven illustrated chapter-book mysteries, and the first preschool concept book. Younger readers can begin with any picture book; children ready for longer stories should read the numbered chapter books from Rosie Revere and the Raucous Riveters through Lila Greer and the Shrieking Shadow.

ABRAMS also publishes separate Why Files nonfiction readers, Big Project activity books, and Ada Twist, Scientist books based on the Netflix show. Those companion lines expand the same world but are not needed to follow the core books here.

Sources: ABRAMS Questioneers branch list.

For parents

What Parents Should Know

The books celebrate curiosity, persistence, and collaboration without pretending that every experiment or plan works the first time. They also make room for shyness, dyslexia, worry, and different ways of contributing.

The chapter mysteries include manageable suspense—missing pets, a break-in, storms, or a spooky-looking clue—but the friends reason through the problem and adults remain available. There is no graphic violence.

Where the story begins

First Book in the Series

Sale price

$1899

Book #1 · Picture Book · Ages 5–9 · 2007

Iggy Peck, Architect

By Andrea Beaty, David Roberts (Illustrator)

A young boy's passion for building is discouraged by his teacher, but he finds a way to use his skills to help his class in a time of need.

32 pages· 698 words· Est. 6 min read-aloud

5.3/7 Bookroo

$19.99Save 5%

Hardcover

Summary: Iggy Peck loves building, but his talent goes unappreciated by his teacher, Miss Lila Greer. When a field trip takes an unexpected turn, Iggy's architectural skills might just save the day. Can he prove the value of his unique gift and show the power of creativity and teamwork? Join Iggy on this adventure where passion meets practicality, and discover how one child's imagination can make a difference.

In reading order

The Questioneers Series

15 books · Published 2007–2026

#1 in Series

Sale price

$1899

Iggy Peck, Architect

Picture Book · Ages 5–9 · 2007

A young boy's passion for building is discouraged by his teacher, but he finds a way to use his skills to help his class in a time of need.

#2 in Series

Sale price

$1899

Rosie Revere, Engineer

Picture Book · Ages 5–8 · 2013

An aspiring engineer makes an invention to help her relative.

#3 in Series

Sale price

$1899

Ada Twist, Scientist

Picture Book · Ages 5–8 · 2016

A young girl's curiosity and love for science lead her to investigate a mysterious smell in her neighborhood.

#4 in Series

Sale price

$1248

Rosie Revere and the Raucous Riveters

Chapter Book · Ages 6–9 · 2018

A young inventor helps her friend participate in an art contest despite her physical limitations

#5 in Series

Sale price

$1248

Ada Twist and the Perilous Pants

Chapter Book · Ages 6–9 · 2019

A young girl tries to solve a mystery involving her uncle's helium pants.

#6 in Series

Sale price

$1899

Sofia Valdez, Future Prez

Picture Book · Ages 5–7 · 2019

A young girl tries to build a park in her neighborhood.

#7 in Series

Sale price

$1248

Iggy Peck and the Mysterious Mansion

Chapter Book · Ages 6–9 · 2020

A young architect discovers a mysterious mansion with a hidden past and a possible ghostly presence.

#8 in Series

Sale price

$1248

Sofia Valdez and the Vanishing Vote

Chapter Book · Ages 6–9 · 2020

A second-grade class decides to get a class pet and learns about the democratic process.

#9 in Series

Sale price

$1797

Aaron Slater, Illustrator

Picture Book · Ages 5–7 · 2021

A young boy struggles to read and write, but finds his voice through art and storytelling.

#10

#10 in Series

Sale price

$1248

Ada Twist and the Disappearing Dogs

Chapter Book · Ages 6–9 · 2022

A group of young friends team up to solve the mystery of missing pets in their town.

#11

#11 in Series

Sale price

$1248

Aaron Slater and the Sneaky Snake

Chapter Book · Ages 6–9 · 2023

A sneaky snake causes chaos, closing the zoo. Can art save the day?

#12

#12 in Series

Sale price

$1899

Lila Greer, Teacher of the Year

Picture Book · Ages 5–7 · 2023

An anxious girl finds hope and courage through a teacher's kindness at her new school.

#13

#13 in Series

Sale price

$1348

Lila Greer and the Shrieking Shadow

Chapter Book · Ages 6–9 · 2025

A stormy night, a shrieking shadow, and stolen art. Can the Questioneers solve the mystery?

#14

#14 in Series

Sale price

$1899

Billie Jean Peet, Athlete

Picture Book · Ages 4–8 · 2025

A musical mishap leads to a surprising discovery of unique talents.

#15

#15 in Series

Sale price

$958

What's That Color?

Board Book · Ages 1–3 · 2026

Discover the magic of mixing colors with baby Questioneers.

Companion series

Ada Twist, Scientist: The Why Files Series

5 books · Published 2021–2024

#2 in Series

Sale price

$1248

All About Plants!

Chapter Book · Ages 5–8 · 2022

Discover the secrets of plants with Ada Twist. What do they eat? Why do some bloom?

#3 in Series

Sale price

$1248

The Science of Baking

Chapter Book · Ages 5–8 · 2022

Discover the science behind baking with Ada Twist's curious experiments.

#5 in Series

Sale price

$1248

Rockin' Robots!

Chapter Book · Ages 5–8 · 2024

Discover the secrets of robots with Ada Twist, Scientist.

Series

Sale price

$1248

Exploring Flight!

Chapter Book · Ages 5–8 · 2021

Uncover the mysteries of flight with Ada Twist. Why do planes and birds fly? Discover the science behind it all.

Series

Sale price

$1248

Bug Bonanza!

Chapter Book · Ages 5–8 · 2023

Explore the mysteries of bugs with Ada Twist, uncovering why they're vital to our world.

Good to know

Common Questions

How many books are in the Questioneers series?

There are 15 books in the Questioneers series. It began with Iggy Peck, Architect in 2007, and the newest book, What's That Color?, was published in 2026.