Ashtown burials

When their parents' seedy old motel burns down on the same night they are visited by a strange man covered in skeleton tattoos, Cyrus, Antigone, and their brother Daniel are introduced to an ancient secret society, and discover that they have an important role in keeping it alive.

"Hunted and on the run, Cyrus and Antigone Smith race to find the inheritance left to them by their benefactor, Billy Bones, before rampaging transmortals can descend on Ashtown and free their buried brothers"--