As the Swedish show “ Summer of 1985 ,” based on a novel by John Ajvide Lindqvist (“ Let the Right One In ,” “Border”), is set to make a splash at Canneseries ’ competition, its production banner Media Res International is sitting on a possible sequel. According to the series producer Anna-Klara Carlsten, the international division of U.S. studio Media Res has signed a first option on Lindqvist’s follow up book “Summer of 1986” (“Sommaren 1986-Lovisa och Melinda”) to be published in Sweden Aug.