Crooked Oak Mysteries Books in Order

Crooked Oak is a spooky middle grade mystery series set in a small English village that keeps turning out to be much stranger than it looks. The main trio, Pete, Nancy, and Krish, are curious, brave, and just nosy enough to get themselves into real danger. They are the kind of friends who read about weird happenings for fun, then find themselves living through the sort of story other people would run away from.

They are not amateur detectives because somebody gave them a badge.

They investigate because the odd things happening around them feel personal. In The Invasion of Crooked Oak, Nancy's parents start acting strangely after the local fracking site shuts down, and soon other adults seem wrong too. That first book sets the pattern for the series: something unsettling appears in an ordinary local place, the adults do not see the whole picture, and the kids have to keep digging until they uncover the truth.

The village itself matters almost as much as the plot. Crooked Oak has fields, woods, farms, school trips, research sites, and quiet roads that should feel safe. Smith uses that familiar backdrop to make the books creepier. In The Beast of Harwood Forest, a trip to Heathland Camp leads Pete, Nancy, and Krish toward an abandoned wartime institute and a forest full of screams. In The Horror of Dunwick Farm, a plane crash near Krish's home brings illness, frightened animals, and a mystery about what escaped from the wreck. In The Terror of Hilltop House, missing sheep and strange slime point the trio toward a research farm where an experiment has gone badly wrong.

That mix of village life and wrong-looking science is the engine of the series.

The tone sits in a sweet spot between mystery, sci-fi, and horror. These books want to give readers a jolt, but they are not bleak for the sake of it. The scares come from suspense, atmosphere, and the sense that normal rules have started to slip. Smith is especially good at taking a small clue, a sound in the dark, a blank stare, a patch of slime, a broken box, and building it into something much bigger.

The friendship at the center keeps everything grounded. Pete, Nancy, and Krish do not always know what they are up against, but they trust one another and keep going. That makes the series feel adventurous as well as eerie. The books are short, fast-moving, and easy to slip into, but they never feel slight. Each one gives the trio a fresh mystery while slowly building a picture of Crooked Oak as a place where curiosity is dangerous and looking away is even worse.

You can read the books as standalones, but they work best in order. Part of the fun is watching the friends grow bolder, the threats get stranger, and the village reveal one more alarming secret each time.