Beautifully made - utterly bewildering. There's no question that this is a skillfully made and evocative film. It beautifully captures the teenaged-fledgling duality of wanting to leave the nest but being uncertain of their ability to master flight, although this was clearly not the film's message. In the preamble the narrator reveals that, years after the event, he still doesn't know why the Lisbon girls killed themselves - that makes two of us. There seems to be little attempt to explain it.
We are presented with a slightly dysfunctional family going through some of the usual traumas of adolescents. The parents are more strict than most, but are not ogres; they display no violence or aggression; they show themselves willing to compromise and their love for their daughters is evident. They rather overreact when the sexually precocious Lux stays out all night with her boyfriend and the girls are kept at home - no locks or chains, just a very severe grounding. The girls become engaged in a bizarre musical dialogue with the local boys (why not just talk?) who ultimately arrange to visit, or perhaps rescue, them. It is at this, apparently hopeful, moment that the girls all kill themselves.
So why? Despair? Punishment for their parents? Punishment for their would-be-rescuers? Teenaged petulance? How could we know? Lux is the only sister whose character gets any examination, and she seems about as deep as a puddle. I guess we are just being invited to share the bewilderment of the narrator and his friends. Not exactly a feel-good movie, but it's exactly what it says on the tin.