Any book that gives me warm and fuzzy feelings will be a rainy day book to me -- most likely, a Golden Age mystery (from either side of the Pond), but not necessarily these alone. To get comfortable, I like to curl up on my sofa with my books and my favorite blanket ...
... and with a mug of tea -- well, actually, I have a mug of tea (preferably the supersized one depicted below) sitting next to me pretty much all day every day, so obviously there has to be tea with my reading, too.
Cat on my lap optional, but as of two weeks ago (again) a virtual certainty!