Randall & Hopkirk (Deceased) (2000)

S01E03 The Best Years of Your Death

Jeannie picks up on her nephew Daniel's unhappiness at his boarding school and decides to ask him about it. He reveals his suspicion that a teacher may have been murdered. To uncover the truth, Jeff and Jeannie take on roles as a teacher and a nurse at the school. As they dig deeper, they discover that the headteacher wields a troubling power over the students.