Northern Nigeria is just a step away from famine on a scale not seen for decades, according to the UN. Hundreds are already dying every day from hunger in a food crisis caused by seven years of brutal Boko Haram insurgency, and hundreds of thousands of lives now hang in the balance. Phoebe Greenwood reports from Maiduguri in Borno state and finds a humanitarian catastrophe that some in Nigeria don’t want the world to see

