You know, I have a love/hate relationship with Ben. Lizzy loves him so much and he has such good moment but during his bad moments- man, I wanted to murder him. 
 Story starts off with Lizzy finding out she is pregnant after a one time thing with Ben. (Lizzy is Anne's sister...from book 2) 
 So this whole story is them navigating the pregnancy and their relationship as friends and seeing if it can develop into more. 
 I loved Lizzy, so damn much. In fact, there were many days where I wanted to punch Ben for her!! 
 Martha (from book 1) makes a reappearance in this one which is meh. I could have done without her, but it sets up the story line so I respect it. 
 Overall, this book is probably the most realistic of the 4 books, and I loved it just as much but for different reasons. 
 You will love Lizzy, and eventually you will love Ben too (after multiple times of wanting to kill him). 
 Love all the follow ups for the other characters!