Nina thinks an alien took the dog. Ada thinks a person took the dog. Neither of them can prove it on page thirty, and getting from there to an answer is the entire book.
Ada Lace is a third grader who builds things. Her neighbor's Yorkie has been stolen. Nina lives next door, believes in things Ada does not, and becomes her best friend anyway. This is the first book in the series, so it is the one that sets up both girls and shows you why the pair works.
The science it actually teaches
A detective story already runs on the scientific method. That is not a clever framing, it is just true, and it is why this book belongs on a science shelf while most chapter mysteries do not.
Watch what Ada actually does. She starts with what is in front of her rather than with what she wants to be true. She turns a mess into a question narrow enough to answer. She builds or repurposes a tool when the question needs one, which is a different move from looking something up. And every time she gets an idea, the idea has to survive contact with the neighborhood before it gets to count.
Nina is the reason this works as science instead of as a puzzle. Nina is not stupid and the book never treats her as the fool. She is a child holding a claim she cannot test, out loud, in the same room as a child holding one she can. Your child gets to watch the two claims get treated differently, and gets to see that the difference is not who is smarter. The difference is that one claim tells you what to go and look for and the other one does not.
That is the specific thing this book leaves behind: a hunch and a hypothesis are not the same object. A hypothesis has homework attached to it. Later in the series, in Take Me to Your Leader, the girls run into a strange signal that Ada cannot simply set aside, and the same lesson comes back in a harder form. This one is the easy version, which is exactly why it should come first.
The child it lands with
The seven to nine year old who is proud of finishing chapters and wants a mystery. The one who has run through Cam Jansen and the Boxcar Children and is ready to be handed something with more machinery in it.
It also lands with a specific child: the one who is the skeptic in their friend group and is starting to be a bit smug about it. Ada is that child, and the book quietly makes her need Nina.
One place to stop and talk
Stop the first time Nina says an alien took the dog, and ask your child how you would prove that wrong.
Most children answer that aliens are not real. That is a belief, not an argument, and it is not what Ada does. Push one step further: what would an alien have had to leave behind, and where would you go to look for it? The moment your child names a specific thing they could go and check, they have written a hypothesis. They are seven. They will not need the word for years.
What to know going in
A dog is stolen and stays missing for most of the book. For a child who loves dogs, that is a real weight to carry across a whole story, and I am not going to tell you how it ends. If your child needs to know the dog is all right before they can start, read the last chapter yourself first and answer them. That is a fair trade for a seven year old and it costs you four minutes.
The band is the other thing. The store tags this grades 2 to 5, and the top of that is generous. A fifth grader who reads well will finish it in an afternoon and feel it was aimed lower, because it was. Treat it as a grade 2 to 4 independent read. For a fifth grader who is a reluctant reader the band is right for a different reason, and the book will not embarrass them.
There is nothing frightening on the page here beyond the missing dog. And this is book one of a series, more than one of which is on our shelf at about seven dollars each, so decide up front whether that is a purchase or a library trip. Your child will decide within a week.
Where to get it
Start here. Ada Lace, on the Case is book one at $6.99, it is the book that introduces both girls, and everything else in the series reads better with it behind them. Buy this one on its own before you buy any of the others. Your child will settle the question of the rest inside a week, and the Stealth Science shelf will still be there when they do.
If your child liked this one
Books we have written about that sit close to this one, by reading level and by subject.
Ada Lace and the Impossible Mission: Scale and Sensors
Ada Lace and the Impossible Mission by Emily Calandrelli
Grade 2 to 5
Amazing Magnetism: Science You Can Check With a Magnet
Amazing Magnetism (the Magic School Bus Chapter Book #12) by Rebecca Carmi
Grade 2 to 4
The Giant Germ: How an Infection Actually Works
The Giant Germ (the Magic School Bus Chapter Book #6) by Joanna Cole
Grade 2 to 4
Browse every book we have written about by age, by kind of book and by subject: Find the right book for your child. Or see the whole Stealth Science shelf.
