Watch VoirFilms. The Gert & Hermien Story shows the rise and fall of one of the most popular singing duos in Dutch history: Gert & Hermien Timmerman. Their career has seen great heights and deep valleys. Their personal lives, which were marked by scandals, were always widely covered in the tabloids. Daughter Sandra, along with some other intimates and confidants of Gert and Hermien, is our guide in the unlikely story of her narcissistic, manipulative father and driven mother.