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Sadie and the Secret of the Swamp

An EERIE swamp.

A HIDDEN Lab.

A GRISLY discovery.

Can Sadie and Newt uncover the secret of the swamp before it's TOO LATE?




Sadie is not impressed by her latest school holiday destination - a cabin in a mud-infested swamp in the middle of nowhere aka "Sanctuary DeVolfe".




Sadie meets Newt, the nerdy kid staying in the cabin next door, and the pair go off exploring the murky depths of the stinky, slimy swamp. But something odd is going on at the Sanctuary. And what is the mysterious and cranky Professor DeVolfe trying to hide?




When her annoying brother Charlie gets sick with a weird virus and then goes missing, Sadie and Newt set out on a mission to find him but soon make a grisly discovery at

the Professor's hidden lab.




Will they find Charlie?

And what secrets are lurking in the swamp?


184 pages, Paperback

Published October 26, 2024

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About the author

Fionna Cosgrove

7 books6 followers

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Displaying 1 - 3 of 3 reviews
Profile Image for Shadyside Library.
345 reviews131 followers
November 3, 2024
This was a fun and quite unique middle grade horror novel! It read very similar to a goosebumps book having a silly sense of humor and spooky vibe. I enjoyed the science sprinkled throughout the book as well, this was a great touch and really gave one of our main characters the nerdy personality he accustomed. Only reason for 4 stars is a bit of a slow start. Other than that, I’d definitely recommend this Australian middle grade horror novel!
Profile Image for A.D. Aro.
Author 6 books66 followers
December 19, 2024
What a fun little book! Read this together with my nine-year-old son and he loved it. We even learned some Australian slang, as we had no idea what an "esky" was, but that is part of the joy of reading: learning!

In "Sadie and the Secret of the Swamp", Fiona has crafted a tale with gooey, muddy mystery to draw readers in and sprinkled in a dash of scares without venturing too far into the swamp. The tone and presentation is perfectly inline with Goosebumps and is sure to delight any young readers with a penchant for silly scares and unraveling mysteries.

What exactly is Professor Devolfe hiding in the swamp? Find out for yourself!
15 reviews1 follower
May 27, 2025
So well-paced with amusing sibling banter, this was a fun and spooky read. The author has a great way of balancing comedy with tension and I absolutely love her unique and random similes!
Displaying 1 - 3 of 3 reviews