Carmen Ejogo is set to star opposite Mahershala Ali in the third season of Nic Pizzolatto's HBO crime anthology series True Detective. The new installment of True Detective tells the story of a macabre crime in the heart of the Ozarks and a mystery that deepens over decades and plays out in three separate time periods. Ejogo will play Amelia Reardon, an Arkansas schoolteacher with a connection to two missing children in 1980. Ali plays the lead role of Wayne Hays, a state…