There have been many on-screen depictions of PTSD over the last few years, but none as well realized as Leave No Trace, because writer/director Debra Granik sees--correctly--the disorder as not just something that changes the perceptions of those afflicted, but completely upends the family dynamic. Ben Foster doesn’t rely on the now-familiar actor’s tropes of PTSD, but instead carries a weight that we see his daughter, newcomer Thomasin McKenzie in a brilliant performance, forced to bear. Their subtle work makes the ending, which you should have tissues on hand for, the only possible route either character can take.