Nine-year-old Milo suffers from retinitis pigmentosa: his eyes are slowly failing, and he will eventually go blind. But for now, he sees the world through a pin hole and notices things other people don't. When Milo's beloved 92-year-old gran succumbs to dementia and moves into a nursing home, Milo begins to notice things amiss at the home. The grown-ups won't listen when he tries to tell them something's wrong so with just Tripi, the nursing home's cook, and Hamlet, his pet pig, to help, Milo sets out on a mission to expose the nursing home and the sinister Nurse Thornhill.