The year is 1978. Ares Ramirez, age 12, lives with his mother, Laurel, and his younger brother Malcolm in a trailer at the edge of the Salton Sea, an unintentionally man-made body of water in the middle of the Southern California desert. It is a desolate, forgotten place, whose inhabitants thrive amidst seemingly impossible circumstances.

Where birds fly by day across the desert sky, by night government fighter planes and helicopters make training runs using live ammunition, and an anonymous dead body floats in from the sea. These events inspire Ares, on the cusp of his adolescence, to...