Well, 'How the Light Gets In' gets you emotionally involved by presenting relatable characters and complex situations. You find yourself rooting for them and feeling their pain and happiness as if it were your own.
It really tugs at your heartstrings. The characters and their struggles make you feel deeply connected and invested.
The novel does a great job of creating emotional depth. The storylines and character development draw you in and make you care about what happens. It also has moments of both joy and sadness that really touch your emotions.