Freshly out of a relationship and questioning her future as an actress, Clare sets off alone on a late-night desert drive from Los Angeles back home to Tucson. When she stops for gas at dusk, an uninvited passenger quietly climbs aboard — a large cockroach with nowhere better to be. What starts as a panic-inducing nightmare slowly transforms into something unexpected: an unlikely companionship that forces Clare to confront her loneliness, her grief, and the messy, uncontrollable nature of life itself.