I actually didn't fly through this book like I had hoped I would. In fact, I fell into a mini reading slump while I was reading this. I had to really push myself to read and boy I'm glad I did.
Adelina Amouteru is a survivor of an illness called the Blood Fever. The children who ends up surviving the blood fever usually receive a special mark and powers. The society they live in despises malfettos (malfettos are the survivors of the blood fever who are left with a mark) and thinks they are an abomination to society. In order to be safe from society, a group of malfettos create a group called the Young Elites.
That is pretty much all I can say without getting too spoilery. The first part