Ring Once for Death 1973

Directed by Robert D. Cardona

Recently widowed Laura Vallance returns home to England after many years living abroad. She knows few people in England, but she desires rest and seclusion in her time of grief. However, she is more alone than she bargained for when she hires Roger Masters as her butler. With small doses of poison, the ruthless butler plans to keeps his wealthy employer incapacitated... permanently.