Katrina is a single mother who takes her young daughter Clara across the country to start a new life. But their car broke down in an uninhabited place. While Katrina was changing her tire, Clara walked away from the desert road and was bitten by a poisonous rattlesnake. Katrina, eager to save her daughter's life, accepted the help of a mysterious woman. The woman miraculously cured Clara, but asked Katrina to kill a stranger as compensation. In order to prevent her daughter from being in danger again at sunset, Katrina must solve a moral dilemma as soon as possible: who should survive and who should die?