Tough-O-Meter

We've got your back. With the Tough-O-Meter, you'll know whether to bring extra layers or Swiss army knives as you summit the literary mountain. (10 = Toughest)

(5) Tree Line

Let's face it: not all of us are child prodigies like Colin. Sure, we understand what's going on in his love life (probably better than he does) and we totally get his road trip with his buddy after a break up, but we're a little lost when it comes to his theorem about dating. He loses us around the time he starts saying things like f(x)=D3x2 – D. All those formulas and graphs can stay in math class, if you ask us.

Luckily though, he spends most of the time explaining the theorem or working on cracking the code, so we can pretty easily figure out what's going down. Plus, there's no denying that we don't need a formula to understand the rest of the book: Colin has major relationship drama and is really just trying to find out who he is. Been there, done that.