About Y.Z. Stein
For kids who always have one more question.
Some kids can name every model, quote the records, and still have a dozen questions. Others have just found a favorite subject and want to know everything about it. Y.Z. Stein makes books for both.
Books for Real Fans
The subject shapes the puzzles.
When kids love a subject, half the fun is getting into the details. Each Y.Z. Stein book explores one favorite subject through illustrated pages, surprising facts, and a mix of puzzles designed around what makes that subject fun.
Sometimes we give a familiar puzzle a twist. Sometimes we invent a challenge that could only belong in that particular book. Readers can dive into whichever puzzle catches their eye, linger over an illustration, or flip ahead to see what record someone managed to break.
How every book is made
One subject
We give each book a whole subject to explore. That leaves room for the big questions fans love and the small details they’re often the first to notice.
Facts we check
We check facts and records against reliable sources and review the illustrations for details a fan would spot.
Puzzles we test
We work through the clues, check the answers, and try the puzzles with young readers. A good challenge can keep a fan guessing right up to the moment it clicks.
The first book
It started with Trains
Trains
Puzzles, Challenges & Discoveries
A railway adventure for ages 8–12, with 45+ unique challenges across nine stations. Peek inside a locomotive, uncover railway secrets, and get a special delivery to RailFest before the gates open.
Contact
Get in touch
Did a puzzle get your family talking? Have a question about a book or a correction to share? We’d love to hear from you.
For grown-ups: parents, grandparents, teachers and anyone choosing books for a young fan.