The present day, more or less. Nemo is 35, an ordinary man, married to Elise, with three children. But life’s turning strange: billboards flash messages addressed only to him; on the streets, he passes strangers with his face; behind the facade of a half-constructed building, he sees helicopters lifting enormous blocks of the ocean... Nemo wakes to find himself trapped in his car, drowning. He wakes and is shot by an unknown assassin. He wakes again... by a swimming pool in the grounds of an opulent mansion. With a new wife and new children...
It’s the year 2092. Mars is the number one holiday destination; science has rendered natural death obsolete. In hospital, as the world's media and population look on, a 120-year-old man is dying. Nemo, the last mortal on earth. Under hypnosis, fragments of his past begin to emerge.
Nemo is 8. Occasionally, he dreams of the future, and occasionally his dreams come true. In his hometown live three little girls, Anna, Elise and Jean. Life offers an infinite variety of possibilities, and as long as Nemo does nothing, anything can happen. But when his parents split up, he is forced to choose. It's impossible, and his life divides in two. The boy plunges headlong into a chaotic world, where nothing happens by chance, yet nothing can be foreseen.
A universe where the beating of a butterfly's wings in Japan can cause storms on the other side of the globe.
So Nemo remains with his father, and departs with his mother. Years pass. In England, 16-year-old Nemo dreams of love, of disaster, of life on Mars. He falls for Elise, and when she rejects him, pursues Jean. Halfway across the world, the other Nemo falls in love with Anna, daughter of his mother's lover. The love of a lifetime. Their clandestine affair is joyous, their days and nights blissful, until his mother and her father part and Anna vanishes from Nemo's life.
Adolescence passes into adulthood. One Nemo lives with Elise. She is prey to depression. He is paralyzed by fear. Another Nemo, married to Jeanne, has achieved everything he dreamed of - money, success, a big swimming pool - and none of it matters. The third Nemo waits for Anna: he has waited ever since they were torn apart. Every day, they pass through the same train station, kept apart by an ocean of 27 minutes. Until a random death reunites them.