The Siberian tiger is one of Earth's rarest and most elusive animals, with as few as 300 remaining. It is so rare, more scientists have been to space than have seen one in the wild. In this series, Liz Bonnin, a former tiger biologist herself, travels to the frozen forests of the Russian Far East to help a team of scientists studying these big cats. Their goal is to uncover the hidden world of this mysterious predator, determine why they are declining and what can be done to save them.