Ferreting out your mysteries — one clue at a time.
Sir Reginald Fluffington the Third is missing.
He's the class hamster, visiting the Castellano house for the weekend on Milo's watch — and Milo did everything right. Fresh water. Careful feeding. The latch checked twice before bed.
The cage is still latched in the morning. The hamster is gone.
Biscuit knows immediately this isn't a simple escape — no hamster closes a cage door behind itself. The trail leads out the pet flap, up the old oak tree, and straight into the territory of a backyard rival far bigger than two ferrets. Getting Sir Reginald home safely will take an unlikely informant, some quick thinking, and one extremely undignified use of a stray sock.
But it's what Biscuit notices on the way to solving the case that lingers with her — a faint, familiar smell that doesn't belong to a raccoon, a hamster, or anything else in this mystery. She's smelled it before. She's just not ready to say where yet.
The Mystery of the Missing Hamster is Episode 3 of the Biscuit & Wren: Ferret Detective Agency series — a funny, fast-paced mystery for middle grade readers, with a season-long thread that's getting harder to ignore.
Perfect for fans of A to Z Mysteries, Hilo, and Desmond Cole Ghost Patrol.
Milo Castellano's birthday party starts in three hours. The cake is on the counter. Everything is fine.
At twelve fifty-one, the cake is gone.
Not moved. Not cut into. Not nibbled by an ambitious ferret. Gone. The counter is empty except for eleven abandoned birthday candles and a single smear of purple frosting pointing toward the back hallway.
Biscuit has a suspect list. She has a timeline. She has a frosting smear that tells her exactly which direction the cake went. What she doesn't have yet is a motive — because when she finally unravels who took the cake and why, it turns out to be the last thing she expected.
(It also turns out that Theo Nakamura is a terrible planner. This will become relevant.)
The Vanishing Birthday Cake is Episode 2 of the Biscuit & Wren: Ferret Detective Agency series — a funny, fast-moving mystery for middle grade readers. Each episode is a complete case. The season mystery keeps building.
The fish tank is shattered. The living room floor is soaked. And every finger in the Castellano household is pointing at Colonel Mustard, the family's enormous, imperious Persian cat.
There's just one problem: Biscuit doesn't think he did it.
Biscuit is a ferret. She can't talk, can't text, and definitely can't explain to the Castellano family that they've got the wrong suspect. But she can observe. She can deduce. And with her impulsive, tunnel-happy partner Wren at her side, she can launch a full investigation — even if the humans have absolutely no idea it's happening.
The clues don't add up to a cat. The clues add up to something else entirely. Something that came in through a loose window at 2:47 in the morning. Something that left behind a single gray feather, a strange smell, and one very important question that Biscuit isn't ready to answer yet.
FAQs
For Young Readers
Can I start with any episode, or do I have to read them in order?
Each episode is its own complete mystery with a beginning, middle, and end — so you can jump in anywhere and still solve the case alongside Biscuit and Wren. That said, if you read them in order you'll pick up on some sneaky clues that run through the whole season. (Biscuit definitely notices things that don't get explained right away. She files them under pending.)
Are Biscuit and Wren real ferrets?
They're fictional, but ferrets really do behave a lot like Biscuit and Wren — curious, clever, surprisingly sneaky, and absolutely obsessed with tunneling into places they don't belong. If you've ever met a ferret, you'll recognize them immediately.
How many episodes are there?
Season 1 has ten episodes, each one a complete mystery. There's also a Season 1 collection that bundles all ten together. And yes — Season 2 is already being planned, because Biscuit still has some things filed under pending.
Will Milo ever figure out that Biscuit and Wren understand everything?
He's getting closer. He has a science notebook with a section called Unexplained Phenomena and he is filling it up. That's all we're saying for now.
Is Colonel Mustard actually innocent?
In Episode 1? Yes. Entirely. One hundred percent. Dad was right all along, which is both satisfying and slightly annoying for everyone else in the household. Beyond Episode 1... well. Biscuit keeps a file on him.
Do the ferrets ever get in trouble?
Constantly. But they're very good at looking innocent afterward.
Is this series scary?
Not at all! The mysteries are puzzles, not frights. There's plenty of humor, a lot of heart, and absolutely no jump scares. Even the most suspicious episode is more cozy mystery than scary story. (If you like spooky, check out the Children's Spooky Blog — but that's a different shelf entirely.)
For Parents & Educators
What age range is this series best suited for? The Biscuit & Wren series is written for middle grade readers ages 10–14, but confident readers as young as 8 can enjoy it with a parent, and reluctant readers older than 14 can finish an episode in one sitting. The humor lands across a wide range, and the mysteries are fair-play — all the clues are there before the reveal.
What reading level are the episodes? Episodes are written at approximately a 5th–6th grade reading level. Chapters are short and punchy (8–12 pages each), making them ideal for readers who need natural stopping points or who are building reading stamina.
Is there any content parents should know about? Nothing of concern. The series contains no violence, no frightening content, no mature themes. The mysteries involve household mischief, neighborhood intrigue, and the occasional misplaced hamster. The Castellano family is warm, intact, and genuinely funny. Colonel Mustarde is occasionally smug but never villainous.
Is this good for reluctant readers? It's designed with them in mind. Short chapters, fast pacing, a lot of humor, and a central duo whose limitations (they understand everything but can't speak) create natural dramatic irony that keeps readers one step ahead of the adults. That's a powerful hook for kids who feel like they're always being underestimated.
Can these be used in a classroom? Absolutely. Each episode functions as a self-contained story with a clear mystery structure (problem, investigation, red herring, resolution), making them useful for teaching inference, sequencing, and deductive reasoning. The season arc rewards readers who track details across episodes — a great exercise in close reading. A classroom discussion guide is in development.
Are the episodes available in print and ebook? Yes — each episode will be available individually in ebook format through Amazon KDP. The Season 1 collection will be available as a complete print and ebook bundle.
Will there be more seasons? Yes. Season 2 is planned and in development. Biscuit is not done.