A year after her experiences on Yamatai, archaeologist Lara Croft turns to her late father's research on the lost city of Kitezh and an artifact called the Divine Source, said to grant immortality. Her search leads her from Syria to the wilderness of Siberia, where she encounters Trinity, a paramilitary organization also seeking the artifact. After being captured and escaping with the help of a man named Jacob, Lara allies with his people, the Remnants, descendants of Kitezh's original inhabitants, to reach the city before Trinity can claim its power.