One possible theme could be regret. Since it's about lost love, there might be a sense of regret for the actions or events that led to the loss of that love.
One possible theme could be self - discovery. The characters might find themselves while falling in love in this unique school setting. Another theme could be the breaking of barriers, as the 'lost borders' in the title might suggest that they are overcoming some sort of limitations in their relationship.
One possible theme could be love. If women are wanted, it might be because they are the object of someone's love. Another theme could be power. Maybe the women hold some kind of power or knowledge that makes them wanted. For example, in some adventure novels, a woman might be wanted for her map - reading skills or her understanding of an ancient language.
Another theme could be the power of dreams throughout history. The novel might show how dreams were seen as powerful forces in different historical eras, whether it was for spiritual guidance, artistic inspiration, or predicting the future. And it could explore how that power has been diminished or changed in modern times.
Another theme could be self - discovery. Being lost forces the boy to learn more about himself, his strengths and weaknesses. For example, he might find out that he's more resourceful than he thought when he has to build a shelter on his own. It's also a journey of growing up in a tough situation.
The themes might include transformation and redemption. The circus, with its various acts and strange characters, could be a place where lost souls transform. For example, a character who has lost their heart might find redemption through the experiences in the circus. It could also be about the allure of the unknown. The strange circus is an unknown world full of mystery, and this could be a central theme as characters are drawn into it while being 'lost hearted'.
Another theme might be identity. Alice Hart may be on a journey to discover or re - discover who she is. The 'lost flowers' could represent parts of her identity that she has forgotten or that have been taken away from her. The novel could explore how she grapples with this and tries to regain a sense of self.
Another theme could be self - discovery. The isolation and challenges of being lost might make the characters learn more about themselves. For example, they might discover their inner strength or weakness.
Another theme is self - discovery. Through the process of losing love, the characters often learn more about themselves. In 'Eat, Pray, Love', Elizabeth Gilbert's journey after her divorce (a form of lost love) is about finding herself again. She travels, eats, prays, and in the end, discovers a new side of herself.
Regret is a big one. The characters often look back on what could have been and feel sorry for their actions or inactions that led to the loss of love.
One common theme could be self - discovery. Characters often find out more about themselves while being in love. Another might be sacrifice, as they may give up certain things for the sake of their love.