The Quarta Parca is a documentary set in Geneva, Switzerland. The protagonist, Sabina Cervoni Gartner, a member of Exit, assists those who have chosen to take their lives legally: she goes to the house of the dying man, supports him psychologically and gives him the drug that will put an end to his suffering. Our film tells a shred of the life of this courageous woman, investigating the reasons for her exceptional civil commitment, but also by exploring her everyday life. Far from any pedagogical or moralistic intent, the film shows the viewer a three-dimensional portrait, poised between great generosity and small human idiosyncrasies.