A touching tale of love, loss and family, The Little Girl in the Radiator is the sometimes heartbreaking story of a man's struggle to care for his mother after her diagnosis with Alzheimer's. Martin Slevin's mother was a highly active, very intelligent and fiercely independent woman who ran her own business. But after her diagnosis, Martin moves back home to care for her. Together they embark on a journey through the various stages of the condition. But one question plagues Martin: who is the little girl in the radiator who his mum has daily conversations with?