Lunático (2014)

Eduardo and Rosario are 84 years old and they've been married for over 70 years. The love between them is the result of a lifetime of peaceful coexistence full of esteem: a once-in-a-lifetime love. When rosario becomes sick, Eduardo starts acting strangely: He is gone in the afternoons and does odd experiments at night. At his age, fear of the impossible does not seem to exist. His grandson Edu decides to investigate what's happening and it doesn't take him long to discover the truth.