The Brain Finds a Leg — Martin Chatterton

Something strange is happening in Farrago Bay and Sheldon McGlone is going to get to the bottom of it.
The local wildlife is behaving strangely and so are some of the grown-ups, particularly his teacher, the weird and elusive Miss Fleming. It doesn't help that Sheldon is being relentlessly pursued by bullies―including his older brother!
Just when things couldn't get much worse, a new kid turns up in Sheldon's classroom. Theophilus Brain, aka “The Brain,” has an excessive imagination and a lot of odd ideas about what is ailing Farrago Bay. With clues like a missing human leg and a crocodile who likes to play fetch, it's up to Sheldon and the Brain to uncover a web of evil that stretches across two continents.
Author Martin Chatterton has crafted a wonderfully imaginative mystery that features memorable, well-drawn characters. The surprising and occasionally hilarious plot twists will engage and delight young readers.