'I'm sitting next to you in the car, but I don't really know who you are anymore.' Due to a dramatic event in their youth, Pepijn and his sister slowly drifted apart. Once adults, their lives only cross at regular intervals. Until they decide to travel together to investigate what is left of their bond. 'Zusje' is a moving account of an attempt to glue together what was once broken. A search for the strength of family ties, for what it means to be brother and sister.