The Corridor, which is a portal to a parallel earth, which is called second earth, appeared 17 years ago. The Corridor almost destroyed second earth and has humans called Mods who have powers. Estele has lived near the Corridor all her life but when it fluctuates near her, she discovers she has a dangerous power to open portals, not just to second earth but other earths. When the Corridor starts to fail, Estele has to somehow save her earth, with the help of an escaped Mod and an arrogant man from another earth, they have to find a way to stabilise the Corridor before it is too late and everyone she has known is destroyed.
The Corridor is an enjoyable YA sci-fi novel, with an interesting idea of the parallel earths and has some romance, twists and some action. It was a bit slow paced at the beginning but it does pick up, however, it is not helped with the book skipping the 6 months when Estele is experimenting with her new powers.
I liked Estele as she was a strong lead who is self-reliant as she did not turn to anyone when she developed her powers and wants to belong. However, she was not as strong as Ana who is haunted by guilt but is still feisty and adaptable. I really liked the romance in this as it was not the first guy we met and Estele was interested in.
I liked this book and I am looking forward to reading the next book The Thirteenth World. I would recommend this to fans of YA sci-fi fans.