It could be about lost girls in various senses, perhaps physically lost in a strange place, or lost in their lives, like they've lost their way, their identities or their purpose. Without reading it, it's hard to be more specific.
I'm not sure specifically as there could be many novels with that title or a similar name. It might be about girls who are lost in some way, perhaps lost in a strange place, lost in their lives, or lost in their identities.
Perhaps there are also some supporting characters like a wise old woman who gives the lost girls advice. Or a young boy who befriends them and helps them in some way. There could also be an antagonist, maybe someone who is trying to keep the girls lost or is causing the problems they are facing.
Another possible theme is survival. Maybe the lost girls are in a tough environment, either physically like a desolate place or socially like an oppressive community. Their struggle to survive and come out of it could be what the novel is mainly about.
Well, it might center around the experiences of girls who have been lost in different ways. It could be physically lost like in a strange place, or lost in terms of their identity or purpose in life. For example, it could tell the story of a girl who gets lost in a big city and has to find her way back home while also discovering things about herself. Maybe it also delves into the emotional turmoil that comes with being lost.