I'm usually reading three books at a time. It's just how I do it.
First is Terry Pratchett's EQUAL RITES,which is a delight. His casual allusions slay me.
Second is TO PERISH IN PENZANCE by Jeanne Dams, an old-fashioned husband and wife mystery that's fun and relaxing.
And I just finished Barbara Kingsolver's THE LACUNA. The woman is a witch, I swear, because her writing casts a spell on me. I tell myself it's not the type of thing I'm interested in (being used to a dead body every few chapters) but I keep reading, keep going back, because I HAVE to know what's going to happen to the protag. Toward the end I knew it couldn't be good, but I STILL had to know. And I have to admit, she pulled it off: if not a happy ending, at least a very satisfying one.