When a mysterious clock is discovered in 2024, four unlikely travelers — a renowned historian, a physics student, a curious young man, and a friar torn from the 19th century — are thrust into a dizzying odyssey through time.

From the ancestral silence of the 9th century to Lisbon devastated by the 1755 earthquake, and into the threats of a dystopian future, they cross paths with figures who shaped — and continue to shape — the destiny of Portugal: King Afonso Henriques, King Sebastian...