Third Insidious film gets go ahead for Aussie 'splat pack' kings James Wan and Leigh Whannell The Lambert family seeks to uncover a mysterious childhood secret that has left them dangerously connected to the spirit world. JAMES Wan and Leigh Whannell have confirmed their place at the top of the "splat pack" with the announcement that a third Insidious film is already in the works. The success of the Aussie horror pairs' micro-budget franchise - Insidious: Chapter 2 opened at the No 1 spot at the US box office at the weekend - mirrors that of their breakthrough film Saw which spawned six sequels and grossed more $US873 million at the box office worldwide. Whannell, who wrote the first two Insidious films, has signed for the threequel, according to respected industry sites Deadline and Variety. Rose Byrne returns for the horror sequel. It is not clear whether Wan, currently in Atlanta filming Fast and Furious 7, will direct. The Lambert family, played by (from left) Barbara Hershey, Patrick Wilson, Ty Simpkins and Rose Byrne When Insidious 2 topped the US box office at the weekend, the Saw co-creator became only the second director ever to have two films opening over $40 million in the same year, according to Box Office Mojo. The Wachowski brothers managed a similar feat in 2003 with The Matrix Reloaded and The Matrix Revolutions, but there were two of them. The Insidious sequel, starring Rose Byrne, Patrick Wilson and Barbara Hershey, took $US41 million in its first weekend. In July, Wan's The Conjuring opened with an impressive $41.9 million. Continuing the saga of the haunted Lambert family, Insidious 2 opens in Australia on November 7.