Serial killers are very good at hiding their true selves. They can mask the brutality with happy family photos, befriending people so that they would say ‘no, they’d never do that’, or even lying so well to the police that they convince them nothing happened… when it clearly did. Karla Homolka was engaged to her first husband Paul Bernardo within months of meeting him, and to the outside world they were an incredibly happy, loved-up couple.Homolka’s family warmed to Bernardo very quickly and they spent a great deal of time together, but this was definitely not as innocent as it seems. Bernardo had a deep, creepy obsession with Karla’s sister, Tammy.