Orphan, clock keeper, and thief, twelve-year-old Hugo lives in the walls of a busy Paris train station, where his survival depends on secrets and anonymity. But when his world suddenly interlocks with an eccentric girl and the owner of a small toy booth in the train station, Hugo's undercover life, and his most precious secret, are put in jeopardy. A cryptic drawing, a treasured notebook, a stolen key, a mechanical man, and a hidden message all come...

While on vacation, a married couple unwittingly befriends a flamboyant and charismatic Russian named Dima, who, unbeknownst to them, is a kingpin money launderer for the mafia. When Dima confides to his new friends that he plans to escape from the mob, they're quickly swept into the dangerous world of international espionage. The unlikely companions must undertake a perilous journey through Paris, Bern, and London in order to save Dima and his family....

Set in the 1920s, two decades after the first series ends, the plot follows the courtship of two teenage Forsyte cousins: Fleur and Jon. Fluer, the daughter of Soames and Annette, and Jon, the son of Irene and Jolyon, meet by chance as youngsters; now Irene's son has fallen in love with the daughter of Soames, the man she despises above all others. Fleur and Jon haven't a clue that Soames and Irene were once married, all they know is that the family...