Bridget Jones's Baby may be one of the most highly anticipated romantic comedies of 2016, but as far as leading man Colin Firth is concerned, it's a mystery film, too.  "There are various mysteries to be resolved," the actor told Entertainment Weekly, which has put the cast of the third Bridget Jones film on its cover.  "Who does she end up with? Whose baby is it? You can resolve one and make the other a question," said Firth. "Those are things which might not be revealed until very later on. I rather like it. It's not often you have something where you have the possibility of keeping a surprise."  Firth returns to the role of Mark Darcy in the film, as does Renée Zellweger's Bridget. But he has a new rival for her affections: Jack Quant, played by the blue-eyed American actor Patrick Dempsey, former star of the medical drama Grey's Anatomy.  The previous films in the franchise, Bridget Jones's Diary (2001) and Bridget Jones: The Edge of Reason (2004), showed Darcy vying with Daniel Cleaver (Hugh Grant) for Bridget's love.  Firth said of Dempsey's character: "He’s a very different kind of rival. He's not somebody I've known since we were kids. He's an outsider and he threatens Mark Darcy in a very, very different way than Daniel did."  Dempsey, who is pictured in character helping Bridget as she struggles at a music festival, says Jack "is astonished by her."  Zellweger told EW: "This is part of the new challenge, discovering where Bridget is now in her new life.”  "I love all these characters. I love her world and her family and her friends,” she continued. "I like that she tells stories about what it’s like to be a woman."  The film is directed by Sharon Maguire, who also helmed the first film in the series.  Bridget Jones's Baby will be released on April 22 2016
New images have been released of Renée Zellweger, Patrick Dempsey and Colin Firth on the set of Bridget Jones's Baby