Sven Hugo Hjerson is character in the Swedish television series Agatha Christie's Hjerson, portrayed by actor Johan Rheborg and the young Sven Hjerson by actor Sam Herrgård. The character is very loosely based on Sven Hjerson, a fictional character “created” by Ariadne Oliver. Not much information about Sven is given by Agatha Christie her works, so the creators of the television series created their own back story for the character.
He is a well known crime investigator.