Female mongooses all give birth on the same night and in the same den. Up to twenty pups are born but by morning three quarters of them are missing – presumed dead. Just who is killing the pups? Scientists Emily Otali and Sarah Hodge are hot on the trail, using a specially designed ‘burrowcam’ to film underground. Pythons, charging elephants and hippo are just some of the obstacles they meet as they investigate one of Africa’s great murder mysteries.