Stunning by Sara Shepard

Here be spoilers for the previous Pretty Little Liars books (Mostly the newer ones, 9 and 10)

This next installment of Pretty Little Liars focuses on Emily's summer, which involved having a secret baby and almost selling it to a crazy lady. She was seduced by the money and privilege that her baby could have had, but then she takes the baby away at the last second once she realizes that the woman is nutso. In this installment, crazy lady has somehow made her way into the girls' lives. She finds out Emily's real name, and Emily worries that it's just a matter of time until everyone finds out about her pregnancy. Everyone thinks crazy lady is the new A. In other matters, she reconnects with Issac, her baby's father. Since Emily never told him that she was pregnant, that relationship is one secret away from combusting.

Hanna is working on her dad's campaign, which gets a bit tricky when it turns out the crazy lady is one of his wealthy sponsors. Other than that, she works to destroy some nice girl that her ex-boyfriend Mike is now dating. It's really annoying and horrible.

Spencer is really accepted into Princeton and everything seems good...until her family starts hounding her about joining an eating club (I don't know, I'm going to Google it- yes, it's actually a thing). So Spencer, being the uptight girl of breeding and refinement that she is, immediately starts wooing some clubs. She fits in well with the girls in the club, but does the typical uptight Spencer shenanigans. Then some minsunderstandings result in her feeding people pot brownies, which- it happens. If I only had a dime!

Finally, the best goes last! Aria sees her boyfriend's father at Whole Foods wearing women's clothing. She is understandably weirded out, and she tries her best to hide the secret from Noel, which is convenient because they had just had a conversation about not keeping secrets from each other. It's an awkward situation all around.

BIG SPOILER
So, in the end it turns out that Noel knows about his dad's cross-dressing. Spencer fed everyone pot brownies, so she's not in the eating club. She might have a new stoner boyfriend, though. Hanna's ickiness actually wins over Mike. It's gross. It turns out that crazy lady might not actually have been crazy after all. She was grieving the death of her stepdaughter, TABITHA. Crazy lady thought that the girls were taking her money and cheating her out of the baby, hence the crazy. She's not A because she's all shot and dead and stuff.