Inspired by the true story of the incidents in Tsavo, in 1898. At the end of the 19th century there is a dispute between the French, Germans and British to take possession of the African continent. Having the advantage, the British commission British engineer John Patterson to oversee the construction of the bridge above the Tsavo River.
In that place, two lions start attacking the workers. The lions were so aggressive that some of the natives deduced that they were not animals but the spirits of the dead healers who came to terrorize the world, while others thought they were the demon who had come to prevent progress from advancing. The beasts are named Shadow and Darkness. Faced with the attacks and with the help of the hunter Remington, the engineer launches himself on a desperate mission to put an end to the animals.
