Short Introduction books

The Very Short Introductions book series are great entries into new subjects. They are written by really respectable authors and provide bibliographies at the back for if you want to read into the subject more. Some of them will cover whole periods, others more specific individuals or ideas, so they are great for working out exactly where your interest lies. They break it down into really manageable chapters and sections and are very clearly written. Each one is only about 120 pages and fits in your coat pocket!