Rainy days are perfect for starting a new book. My favorite author is Ted Dekker and I am currently reading his Lost Books series. I am on the third book, "Renegade". I do not have a hard copy of it unfortunately, so I have been listening to it from audible.com.
I love how books take you to a new world and you get to be the director of the movie playing out in your head. Ted Dekker creates such elaborate characters which allows you to imagine things you never thought about, such as talking bats. If you are looking for a good read, I highly recommend starting one of his many series.