Masterpiece PBS ‘ The Forsytes has expanded its cast as its begins production in Croatia on its third season. Gregg Sulkin ( The Six Triple Eight , World on Fire ) and Gabriel Antunes ( Hey Joe, FBI International ) have joined the returning ensemble for Season 3, which will see the Forsyte family on holiday in the French Riviera. Per the logline, when the wealthy Forsytes try to get some respite in the glamorous French Riviera, they quickly realize that they can’t escape their family drama. The casino, the beach and a luxurious hotel are all settings for the third chapter, which brings new characters into the family’s lives. Debbie Horsfield ( Poldark)  penned the adaptation and Joss Agnew ( Outrageous , Poldark ) directs. Benjamin Greenacre serves as producer, alongside Imogen Wenner as Associate Producer . Horsfield and Damien Timmer executive produce for Mammoth Screen, part of ITV Studios, along with Susanne Simpson for Masterpiece.…