Over Our Heads (The Valens Legacy Book 3)

Sean's still up to his neck in trouble, but at least he's finally found
an example of his father's work, along with all of his notes. Now all
Sean has to do is figure out not only how to reproduce his father's
greatest achievement, but to solve the one problem his father wasn't
able to. Holed up in a cold war era bomb shelter, all Sean wants to do
now is keep his head down and his family safe, while he untangles this
latest problem.
Like it or not however, Sean has set events in
motion that will change the future for all of the mages and supernatural
beings involved, should he prove successful. While many may welcome
these changes and the freedom it will bring them, some of the more
powerful councils will most definitely not.