Summer vs Winter

I like conversations that drift into stories about books.  Today a conversation about business strategy and drifted into something like this:

Add this to your list but don't read it now...it's depressing.
Is it a winter book?
Exactly.
I need a summer book.
Inferno is a good summer book.
Should I really read that?
It's a typical Dan Brown formula, it's predictable in a way and yet you want to keep reading.
So a summer book?
Yeah, a summer book.
Have you read 100 year old man?
Yes! It was so funny.
A great summer book.  

The strategy of book reading.