Black Box(2009)

Original title: Caja Negra

After Emiliano dies from poisoning, a vault in Zürich opens to reveal a video tape of edited fragments from surveillance cameras that captured the most important day in Emiliano's life. That day he learned that what matters most in life are not beginnings or endings, what matters most is one defining moment: his peculiar encounter with Juan when he recruited him to assassinate a former presidencial candidate.