A book that makes you happy, i.e., a book you reach for when you are all alone in an unknown city, i.e., the literary equivalent of ghee-bhaat-dim seddho, i.e., total awesomeness.
Sharadindu Chhotogolpo Somogro. Because Bhollu Sardar. Because Pragjyotish. Because Haasi-Kanna. Because Kanu Kohe Rai. Because rarely does happiness come so neatly packed in a few pages.