Just as there is little better on a rainy day than to read, so there is little better on cold days than to read (don’t you see a pattern here?). My personal recommendation is a novel, The Murder of Roger Ackroyd, by Agatha Christie.
The Murder of Roger Ackroyd is longer than some of Agatha Christie’s books; it is two hundred fifty some-odd pages long. It also is the introductory novel for her famed detective, Hercule Poirot.
The plot is full of twists and turns, and I never guessed who the murder was (I have guessed right before). In fact, all of Christie’s murder mysteries are nearly impossible to solve on your own, so it rather depends on your point of view as to whether you’ll love her books or hate them.
Many of Agatha Christie’s books are still in print. They can be found at new book bookstores, and at very good prices used. (At least, that’s what I’ve found.) A very few of her books are also available for free on the Kindle.