When the body of social worker Kera Jacobsen shows up on Chief Medical Examiner Laurie Montgomery’s autopsy table, it appears at first that she was the victim of a tragic drug overdose. But for Laurie and her new pathology resident, the brilliant but outspoken Dr. Aria Nichols, further investigation reveals an alarming discovery. The young woman was ten weeks pregnant when she died, but nobody seems to know who the father was – or whether he holds the key to Kera’s final moments alive.