I'm going to just come right out and admit it -- I am a fan of the novella. There are some nights I come home tired and simply want to relax and read a book I can finish before I go to bed. It seems like novellas have been experiencing a boom in popularity lately, particularly in eBook format. Some are part of a theme, stories based on a holiday or a love of pets, for example. Some bookend a series, giving a glimpse into the beginning or the end of a story. Some occupy the same world as a popular series, but completely stand on their own. So, there's bound to be something to appeal to your reading tastes and limited schedule.