The Persuaders! (1971)

S01E22 The Ozerov Inheritance

Title: The Ozerov Legacy Plot: An aging Russian duchess strives to keep her family’s precious jewels by proving her marriage ties to the Russian Royal Family. She claims that a journal belonging to one of Brett's uncles holds the key to her evidence. With time running out, she seeks Brett's assistance to uncover the truth hidden within the pages of the past.