Context : The Secret in Their Eyes (Spanish: El secreto de sus ojos) is a 2009 Argentine crime thriller film directed, produced and edited by Juan José Campanella and written by Eduardo Sacheri and Campanella, based on Sacheri's novel La pregunta de sus ojos (The Question in Their Eyes). 
Subject : The Secret in Their Eyes 
Relation : based on
Which is the basis of The Secret in Their Eyes?