Joe, Tom, and Pip are excited to spend their holidays with Grandma in Mantlemoor. They will climb trees all day, eat chocolates, and lounge on the sofa.

However, they forget that Mantlemoor is a very dangerous place. When they learn that a horrible chicken farming factory will be built in Mr. Draper's meadow, the children react. They start protests to save the chickens.

But very soon they notice that all of Mr. Draper's opponents begin to fall ill one by one. Oh no! Is he poisoning them? And if so, is their grandmother in danger?

Discover the entire series of The Mysteries of Mantlemoor.