Every mother faces impossible choices. Vaccination is one of the hardest. For single mum Kate O'Hara, her daughter Rosie can't be vaccinated against measles. All Kate can do is hope that her little girl is safe. For Madeleine Cooper, it was a leap of faith she wasn't prepared to take when she declined controversial measles jabs for her daughter Clara. But when classmates Clara and Rosie both become sick will Kate pay for Madeleine's choice?