Just finished "Dark Market. CyberThieves, CyberCops and You" (auf deutsch: Cyber Crime. Kriminalität und Krieg im digitalen Zeitalter) by Misha Glenny. A little bit simplifying this book tells the story behind all the spam mails we get and how our answers (I hope you never do
) are exchanged into money. Thoroughly researched, very interesting, instructive and entertaining.