BritBox has dropped the trailer for its miniseries “The Confessions of Frannie Langton,” which will premiere all four episodes March 8 in the United States. Starring Karla-Simone Spence in the lead role, “The Confessions of Frannie Langton” depicts a woman who is forcibly employed as a maid in a wealthy London household. When the estate’s owners are suddenly murdered, Frannie is perceived as the culprit and brought to prison, where she attempts to uncover the truth. “This is my story, and it’s a story of love,” Spence says in a voiceover omnipresent throughout the trailer. “Though everyone expected it to...