12 Million Girls

Around the world, more than 650 million women alive today were married as children. And each year, 12 million girls are married before they reach 18. Although Malawi outlaws marriage for those under 18 years, cultural norms and poverty means the practice persists.

BBC 100 Women visits the country to meet girls at risk and the grassroots organisations working to fix the problem - alongside three of the world's most high profile humanitarians, Michelle Obama, Amal Clooney and Melinda French Gates.