Please do not read this post until you have read THIS ONE first otherwise the first book will be spoiled!
In the first book, Need, it ends with Zara semi-solving her pixie problem. But the choice she makes is haunting her, what she made was a cage, a prison, which goes against the fundamental beliefs she fights for. Torn by her decision, Zara alters her plan, and makes a mistake. This mistake not only costs Zara, but her friends and family as well. Because, while Zara tries to right a wrong, someone else is plotting against her. In the end, there are friends lost, enemies gained, and Zara is changed forever.
Sidenote: if anyone knows when the trilogy will be released, let me know!