Zoey goes down to the stream and something is wrong with it. Not with an animal. With the water.
That is the difference between book three and the rest of the series, and it is a larger difference than it sounds. The magical creatures living in that stream are in danger, the publisher's own copy says things get urgent, and the mystery Zoey has to work out is the stream itself.
It is built like the others. Early chapter book, short chapters, big type, a picture on nearly every page, a glossary at the back.
The science it actually teaches
Ask a grown adult what a fish breathes. Most say water. The ones who say oxygen usually mean the oxygen locked inside the water molecule, which is also wrong, and it is wrong in an interesting way.
What a fish uses is oxygen that has dissolved into the water out of the air above it. A small amount of gas mixed through a liquid. Nothing is split, nothing is broken open, and it can run out.
How much is in there is not fixed either. Water that tumbles over rocks takes air in. Water that sits still takes in far less. Warm water holds less than cold water. Water crowded with things that are themselves using oxygen has less to go round. So a stream that was fine can stop being fine with nothing visibly happening to the animals in it at all. A child who understands that has understood something true about ponds, about fish going belly up in a hot August, and about why a fish tank at home needs something running in it all night.
The second thing is the shape of the investigation, and it is not the shape school teaches. Zoey does not set two things side by side and change one of them, because you cannot run a controlled trial on a stream you are standing in. She looks, she tracks, and she works backwards. Water runs downhill, so the cause of anything you notice sits above the place you noticed it, every time, without exception. Going upstream is not a figure of speech in this book. It is the method, and it is the one thing a child can carry to any creek in the world.
The third thing is quieter and I like it best. Zoey has to act while she is still not sure. Animals are in danger and the clock is running, so she works with the best answer she has rather than the complete one. Real science does that constantly and school science almost never admits it.
The trouble here is also not inside an animal where it can be examined, which is a real difficulty and not a plot convenience. A place does not limp and it does not go off its food. It just stops working, and you have to go and find out why. What the book does not have is merhorse biology, for the obvious reason. Everything above is about water, and water is real.
The child it lands with
The child who turns rocks over in a creek and puts them back the wrong way up. The one who wants to know what lives underneath things. The one with a tank, or the one who wants a tank and keeps asking why the filter has to run when everybody is asleep.
It is also the Zoey book for a child who has gone off animal stories because animal stories are always about somebody's pet. Nothing here is a pet. These animals live somewhere, and where they live is the problem.
One place to stop and talk
Answer this one yourself first, because most adults cannot: what does a fish actually breathe? Then stop at the moment Zoey works out that the trouble is in the water, and put the same question to your child. The answer surprises nearly everybody, and it is the one fact from this book that will still be there in a year.
What to know going in
Book three is the tense one. The rest of the series puts a poorly animal in the barn and fixes it. This one puts animals in danger where they live and makes the danger urgent, and for a small child those are different feelings. If your five year old was fine with a baby dragon with a bad stomach, understand that this is a step up in worry, and the worry is vaguer, because the threat is not inside an animal where it can be treated. It is in the world around them.
Nothing dies on the page and it resolves. I would still read this one alongside a tender five year old rather than handing it over and going to fold laundry.
The band is grades 1 to 4, right at the bottom and optimistic at the top for a child reading alone, the same as every book in this series.
Where to get it
You can start here, which is not true of most of the series. Book three stands up on its own better than its number suggests, and for a child who cares about wild animals rather than pets it is a better first taste than book one. It is $5.99 at Merhorses and Bubbles, and the rest of the shelf is at Stealth Science. Buy it in spring and not in December, because the day after you finish it your child is going to want to stand in a real stream, and nothing in the book works half as well as that does.
If your child liked this one
Books we have written about that sit close to this one, by reading level and by subject.
Caterflies and Ice: The Book Where Zoey Gets It Wrong
Caterflies and Ice: Zoey and Sassafras #4 by Asia Citro
Grade 1 to 4
Dragons and Marshmallows: The Science and the Catch
Dragons and Marshmallows: Zoey and Sassafras #1 by Asia Citro
Grade 1 to 4
A Beehive Is a City: The Magic School Bus Inside One
The Magic School Bus Inside a Beehive by Joanna Cole
Grade 2 to 5
Who Really Killed Cock Robin? A Food Web as a Suspect List
Who Really Killed Cock Robin?: An Ecological Mystery by Jean Craighead George
Grade 4 to 7
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.
