The main character, Millie, becomes involved with a secret organization called the Arcadia Project, which manages the Fey presence in our world, which remains unknown to the general population.

I can't give readers actual choices in such a linear form, but I can try to imagine what they'd choose, and I can decide at a given point in the story whether it's best to gratify their desires or frustrate them.

During her search, she uncovers shocking truths about Hollywood, such as the fact that almost every famous actor and filmmaker in history is connected to their Fey "echo", a sort of "soulmate" through which a person's talents can reach their full potential.

In her NPR review of Borderline, Amal El-Mohtar calls the novel a "remarkably smooth and assured launch for her Arcadia Project series — a fast-paced story of high costs laced with humor that goes from light-hearted to scathing with the flip of a coin".

Her first-person narration walks an amazing line between conveying her personality and explaining the way BPD interacts with it, while never actually making it or her disability the focus of the plot or giving the book an After-School Special feel".

[6] In another starred review, Library Journal's verdict is that "Baker’s debut takes gritty urban fantasy in a new direction with flawed characters, painful life lessons, and not a small amount of humor.

The review does note, though, that the story "layers so many unlikely incidents that it strains credibility even in a world stuffed with the fantastical", and that Millie, "brash and volatile, crashes through and pulls everything along in her wake".

However, the review adds that Millie's "stubborn insistence on survival and frequent matter-of-fact dissections of her problems manage to provoke fondness instead of pity", and that the "verve, sarcasm, and decency" with which she faces her catastrophic challenges "bode well for a developing series".