The movie opens with an idyllic, bright, summer beach scene at a seaside resort somewhere along the French coastline. The beach teems with waders and sunbathers enjoying the weather and each other. Ava, a thirteen-year-old girl vacationing with her single mother and baby sister, is napping on a rock wall. A large, black dog makes its away along the beach and encounters the sleeping Ava. She awakes, startles, and the dog runs off. She follows the dog to its owner, Juan, who is in the midst of a lover’s spat. The police come and take Juan away—he doesn’t have “papers.” This is not the last time Ava meets both Juan and his dog.

While on this holiday, Ava sees her ophthalmologist who informs her that her eyesight is worsening—she has retinitis pigmentosa, and a form that progresses to blindness more rapidly than other forms. The ophthalmologist tells Ava: 

Your field of view will shrink and you’ll lose your night vision before the circle closes. It can happen very young...Soon you won’t see well in low light...at night when a place is poorly lit, say...You’ll lose your sight soon.

Ava is shattered. She wishes that the ophthalmologist was dead: “He ruined our summer,” she says to her mother, who in response pledges, “we’ll have a great summer. We have two weeks. That’s good. They won’t spoil our summer. Screw them.” What happens during these two weeks comprises most of the movie.

Ava sees her prospects for the future vanish as her vision deteriorates. She needs to get as much life in as possible before then, and it begins with the time she has left at the beach. Feeding this urgency is Ava’s concern that the end of civilization could be nearing based on evidence a recreation staff member provided, and the approval her mother gives for engaging in sex: “My first time was very early. I was thirteen like you. I understand you wanting to try. I couldn’t stop you. You’ll do as you want, I know.” With this permission from her mother and feeling “My mother is probably unhappy with a daughter like me,” little pressure is left that could counter Ava’s desire to accelerate the accumulation of life experiences, no matter how risky. 

And so Ava is off and running, making her first act stealing Juan’s dog. This eventually brings them together. Juan is older, looking like he’s in his late teens, and he’s on the lamb. She joins him and experiences sex, plunder, violence, and close calls with police. We are left wondering what will happen to Ava; the circle is closing.