Gus the Grumpy Guinea Pig: The Case of the Borrowed Pet: A funny mystery chapter book for kids ages 6-9

Meet Gus - the grumpiest guinea pig in Year 3… and the world's most reluctant detective.

Gus likes his life exactly the way it is.
Warm radiator. Familiar classroom. Very important job keeping an eye on Classroom Three.
So when Gus is borrowed and sent to a different classroom, he knows one thing straight away: this is a terrible idea.

While Gus shivers by an unfamiliar window, strange things start happening back home. Cages are moved. Routines are changed. And someone seems a little too pleased that Detective Gus isn't around. With the help of Katie and Leo, Gus must solve his trickiest mystery yet... from the wrong classroom.

But what happens when being borrowed starts to feel a bit too permanent?

Funny, thoughtful, and packed with dry humour, The Case of the Borrowed Pet is a gentle school mystery about change, belonging, and noticing when something just isn't right. Told from Gus's brilliantly sarcastic point of view, this early chapter book is perfect for confident readers aged 6-9, and for reading aloud at home or in the classroom.

Ideal for fans of Dog Man, Investigators, Paddington, and animal-led school stories, this is the third adventure in the much-loved Gus the Grumpy Guinea Pig Mysteries series.

Will Gus get back to where he belongs…
or has Classroom Three learned to live without him?