Trio is a cinematic series of filmed portraits that shows, in a single large, fixed and silent shot of 3 minutes and 20 seconds, three people free to do what they want.
In a train compartment, 6 people who do not know each other tell the story of their troubles in love. Only one of those seems to be a positive one.
A 4-year-old child is the element from and around which the action develops, and brings sentiments and emotions to light.
Parallel lives of two couples destined to suicide, one, and unhappiness, the other.