The Sundarbans is the largest mangrove forest in the world. Six times the size of Greater London, it’s a tidal jungle that’s been created where the Ganges and Brahmaputra rivers enter the Bay of Bengal. The delta is rich and diverse in wildlife and a sanctuary for 400 or so Bengal tigers. Throughout Asia and the Russian Far East, tigers are on the brink of extinction. The Sundarbans is one of the largest tracts of wilderness left in their range. Tigers are usually frightened of people, but not here. Many are known to be habitual man-eaters. Scientist Adam Barlow and the Forest Department’s Tiger Response Team are battling to save an endangered big cat, while also struggling to keep local people safe. But the tiger is making their job increasingly difficult, because it’s no longer just the people working inside the forest who are at risk from attack. Tigers can easily cross rivers, they’re excellent swimmers, and some are venturing into villages that border the forest.