This book is a must read if you have enjoyed the Otherworld series. It is an extremely fast read that you will not want to put down. Camille is facing Hyto, Smoky's father in this novel. I would not call this book easy going, it is rather dark. You will see how strong Camille is and how her character's strength continues to grow both emotionally and magically. I really can't say much more without giving away things, so I will just tell you now to go purchase this book when it comes out!
I would suggest reading Iris's story before reading Courting Darkness. Parts of Iris's story are mentioned a few times in this book, but it does not require reading it to fully understand.
Iris's story is located in the book Hexed, it is named Ice Shards, the book also includes 3 other novellas from other authors.