This week's question and last week's question go quite well together.
What’s the funniest book you’ve read recently?
I'm not sure if this book is the funniest, but it's as good an answer as any... I enjoyed Wimbledon Poisoner by Nigel Williams quite a lot. There were parts that made me laugh out loud (I guess I just "get" the author's humor). I'd definitely be interested in reading other books by Williams.
What’s the most serious book you’ve read recently?
Serious fiction? Georg Letham: Physician and Murderer by Ernst Weiss