Fans won’t be instantly smitten with Unforgotten’s new detective chief inspector, and that’s fine with Chris Lang, the creator and writer of the engrossing British cold-case drama, returning for Season 5 on Sunday, September 3, on PBS. He anticipated it would take time for viewers to warm up to Jessica James (Sinéad Keenan), who replaces Nicola Walker’s Cassie Stuart in the Masterpiece series’ fifth season following the beloved character’s death. Lang’s solution: to have her still-grieving colleagues, led by Detective Inspector Sunny Khan, also struggle to forge a connection with their boss, even though nine months have passed since Cassie died. “I knew the audience would come to it feeling a huge sense of loss and probably some resentment,” Lang says. “So I wanted to dive straight in to a man who’s still wrestling with grief and loss, which is impacting his professional life and...