In January 2018, in a quiet flat in Rugby, a three-year-old girl stopped breathing. Her mother, Louise Porton, told paramedics she had simply found her daughter in bed, unresponsive. No obvious cause of death was found. Seventeen days later, the child’s sister was dead too. Both girls, described by those who knew them as golden, were gone. Porton insisted their deaths were unexplained, but evidence from her mobile phone told a different story…