Borrowed from a friend.
It's definitely for fans of Unicorn Academy and reminds of Enid Blyton stories from my youth.
What makes this mystery special is that it is set in Ireland. The use of local terminology really sets the context, from mam for mum, grand and mitching.
It follows Grace and Aaron who love ponies, when they discover dead fish in the local river they decide to investigate to discover the causes. A lovely simple easy read, with still the depth of characters that you can't help but adore.