"Atlas. The Story of Pa Salt" is the final book in Lucinda Riley’s series about sisters named after the Pleiades constellation. The events take place in 1928 in Paris, where a kind family finds and shelters a closed-off but talented boy. The child doesn’t speak, but keeps a diary, and his past hides horrors. In 2008, the seven sisters gather aboard the "Titan" to learn the secrets of their father—whom they barely knew—and secrets that may affect their future.