Trapped in the secret passage Book

This was a roller coaster of a read - not in regards to plot, but in my feelings for the book. It starts out as one of the most dry books I've ever read. Other reviewers raved about the characterization....what characterization exactly? It wasn't until I was almost finished with the book that I realized essential aspects of the two awkward protagonists. I think about halfway through the novel some essential questions started to be raised such as if one can truly "escape" home despite traveling across the country, a question I myself have frequently struggled with. Also, the brother and sister protagonists struggle with distance because of a very strong relationship and make critical decisions to "find" each other again. This hit me hard, especially now that my brother and I, who were always so close, are so distant from each other not only physically but also emotionally which is one of the most painful feelings I've ever experienced. But the characters make some unusual decisions due to these feelings (like living outside in a swamp?) and the ending leaves absolutely no resolution - only more questions. Ambiguous endings can be intriguing and mysterious when done eloquently, but this ending was awkward, disturbing, and unclear (was she actually talking to her lover or only imagining it? -for that would make a huge difference.). Yes, some descriptions were somewhat pretty and lyrical but overall, I'm glad this tedious novel has come to an end.