As a child Anna always loved chemistry, she did couple of experiments of her own sometimes, now that she grew up to being 14, she was allowed by her parents that she can work and do some experiments, as long as she informed parents about it, so they can keep a close on her. Though she was not the only one who loved chemistry, Helen, George, Fiona, and Xander also loved chemistry, so when it came to a chemistry competition one day for ages 14 to 20, she immediately went to go tell her parents with excitement, her parents as usual always reluctant about her doing those stuff agreed to make their child happy to be given a once in a lifetime chance. But soon Anna realizes that chemistry can lead to something dangerous too, not just for creating amazing or edible liquids, but highly and deadly acidic ones too.
In the epic conclusion to the Devil's Deal series, Freya has one final chance to discover the full potential of her own power, and to use it to restore balance in the universe - once and for all. After the destruction caused by Roisin, Ferya and Torix come to terms with their losses and mistakes... And prepare for a final battle that will change everything.