When the Paris police's vice squad - on the orders of Police Chief Lépine - begin to clean prostitutes off the city's streets, a man's body is found in the Bois de Boulogne. Inspector Antoine Jouin is entrusted with the investigation.

After finding a young man's remains, Léa wakes up in the 90s and body swaps seven times as she tries to solve the mystery of his death — and prevent it.

Paris, France, 1899. The corpse of an unknown woman is found in the river Seine. The investigation will push a young ambitious inspector to discover a heavy state secret.