At the heart of Unseen Shadows is a secret war which has waged since the first crusade and still continues to this day. It's a rich universe brimming with adventurers, spies, mercenaries and thieves, battling enemies, both human and supernatural.
“The spin-offs expand and enhance the characters lives and relationships within the novels. These are not nice little side stories with no impact on the events surrounding them. It was important that the spin offs can be read, watched and listened to independently of each other, but you will also get more insights into the characters by experiencing everything the USU has to offer.” - Barry Nugent
All that remains to say is watch your step and welcome to the Shadows.