Gus (Augusta) Curtis is about to turn 30 and is having relationship issues. Her main problem: the guy she thought was her Mr. Right, Nate, is fooling around behind her back. When Nate's housemate, Henry, lets Gus into their house ON PURPOSE so she can catch Nate and her so-called friend Helen lip-locked, Gus isn't sure if she's angrier at Nate, Helen or Henry.

Chapter one introduces the reader to Gus, who is at a bar with her friends Amy Lee and Oscar, talking about Nate and Helen, who have now been going at it for four months, and Gus still can’t get over it. They reminisce over their history together, this large group of friends that met during their college years and are still going strong. In their circle of friends, everyone loves Nate, Gus and Amy Lee agree, and Amy Lee even admits to having had a crush on Nate for maybe fifteen seconds. But it wasn’t until just recently that Nate and Gus hooked up after having known each other for years. Gus felt they were the perfect match until Helen came into the picture and ruined everything - Helen, who happened to also be Gus’s college roommate and someone who Gus thought was a good friend. It’s during this gathering that Gus has a little too much to drink and makes a fool of herself as Nate, Helen, and all their friends look on. It’s not the first or the last time Gus finds herself in an embarrassing situation while in the company of Nate and Helen; she just cannot seem to control herself.

What’s worse is that Nate was part of Gus’s plan, the plan that would lead her to her 30th birthday. She was hoping so much that Nate was THE one, and she thought they were so happy. The entire novel has Gus plotting to get Nate back. She feels there are signs everywhere proving that Nate really wants to be with her and not with ex-friend Helen, a woman so evil that no one believes Gus's accusations that Helen is playing games with Gus, taunting her. Knowing looks from Nate when Helen is too busy to notice, phone calls and voice mails - all these signs lead Gus to believe that Nate is desperately trying to win her back. In the meantime, Helen acts as if she were the innocent bystander who Nate decided he'd rather be with. As weird things continue to happen, Gus realizes that Helen has an agenda. In fact, Helen starts to stalk Gus, a bizarre situation that has Gus in a panic.

Besides the ex-boyfriend issues, Gus and her most intimate group of friends, Amy Lee and Georgia, are having their own problems. While Gus is trying to get Nate back, Georgia is continuously going through boyfriends, men who are no good for her. Amy Lee has a meltdown as she realizes her two best friends are never going to grow up, and it causes a fracture in their close relationship. Gus cannot believe that her two best friends may no longer be a part of her life.

I laughed a lot as I read Frenemies, watching Gus get into one bad situation after another due to massive amounts of booze and/or her delusions that Nate is pining over her. At the same time, Henry is driving her nuts as he keeps showing up at all the wrong times and somehow ends up in bed with Gus as well, making Gus even crazier than she was to begin with.

I had a hard time putting down Frenemies and was hoping that Gus would finally get her act together and figure out who her friends really were. It’s also interesting to note how she slowly learns that her perceptions of people have been way off, slowly coming to the realization that not everyone is who they appear to be. Frenemies is a smart, enjoyable book, and I will gladly read more by Megan Crane.