We’ve all done it: faced with a stack of unread books, we pick up an old, trusty one, its spine cracked and story long ago memorized.  We think, ‘ooh, maybe its time to reread this again!”

Why do certain books and series inspire us to reread them?  What is it that makes rereading a pleasure rather than a tiresome bore?

Since I’ve just tucked into the Harry Potter series for the third go-round, these questions are on my mind.  What possesses me to plow through thousands of pages after already having done it twice?  Upon reflection, I think I’ve lit on a few factors that make a book rereadable:

1. Books that are intricately plotted.

The Potter books provide a good example here.  While there are flaws with the writing – you can accuse it of being too simplistic, find repetitive descriptions, etc. – I argue Rowling is great at planting seeds for plot devices that won’t become important for several books.  The opal necklace used to curse one of the students in “Half Blood Prince” is first seen by Harry in Knockturn Alley in Book 2.  Also in Book 2, we learn Voldemort inadvertently transferred a part of himself into Harry when his curse rebounded, something that shapes the eventual denouement in the final book.  Either Rowling knew exactly what was going to happen (which would be incredible) or was very good at going back to mine earlier books for plot devices as she developed later portions of the story.  It’s delightful to reread and mine out these little treasures (yes, I am a nerd).

2.  Books that deliver excellent surprises

Well-crafted twists and turns are a treat to revisit.  What unfolded the first time as a series of deftly created surprises, reads the second or third time as a how-to demonstration.  Rereading, you can hunt for clues, wondering how you missed them the first time around.  Creating a good surprise is a keen authorial trick – you want the reader to feel that, rather than having been hoodwinked, the surprise is the very thing they wanted to happen all along but didn’t know it.  Not easy to do.  Stories pulling off the good surprise are fun to reread because we relish the surprise AND because we like to go back and see how it was done.

3. Books with really satisfying endings.

There are plenty of books I loved 99% of and hated the ending.  Endings are tough, it’s easy for them to fall short of expectations.  As an author, you have to bring all those plot threads together, balance the scales in a way that’s consistent with the characters and their prior behavior, create a sense of “aha!” (those tricky surprises) and satisfy the reader’s sense of justice.  So, when this is done properly, it’s just damn satisfying and you want to relish it again and again.

4. Books with beloved characters.

Some books we reread not because the story itself was anything special, but because of the character(s).  A character you want to spend time with, even if it means retreading their old adventures, is a rare treasure.  Here I think of Sookie Stackhouse in the first few novels of the Southern Vampire series (not to be confused with the whining, annoying Sookie of the later books or the girl in the TV show…not having a TV, I’ve not seen True Blood).

5. And, finally, there’s the sheer comfort of reading a story that you know is going to delight you. There’s no anxiety it might turn out poorly.  You know the plot isn’t going to fall apart halfway through or that the characters will do something you just can’t forgive.

So, what books can you just not seem to put down?  For me it’s classics like the Potter series and the Lord of the Rings trilogy, and, as an odd outlier, a funny old book called The Eight, by Katherine Neville.  What about you?