She travelled to Mexico with her family for what was meant to be a routine procedure. But she came home in a body bag. Melissa Lewis travels to Mexico with her husband and teenage son, Elliot and Henry, and Elliot's brother, George, alongside his family. Melissa is looking for one final sign that her broken marriage is worth saving. This trip is the opportunity she was waiting for. But when Melissa is found dead in her hotel room, her whole family is thrown into a murder investigation led by two Detectives, Ana Molina and Franco Gutierrez. Suspicions quickly rise when the Detectives conclude that only Henry and Elliot were seen entering the hotel room that night. When Melissa's autopsy reveals that her kidney was removed during surgery, Elliot is forced to question everything he thought he knew about the people closest to him. Told through multiple perspectives and flashbacks, A Routine Procedure shows the painful implications of unaddressed grief and loss. This story proves that the people Melissa loved can act with their best intentions but still get it wrong. But who?