Hunters and Shadowhunters: Supernatural/Mortal Instruments fanfic

When the Lightwoods head out for a hunting trip, they never thought their life could change so suddenly. Fateful events lead to the Shadowhunters coming face to face with two hunters, the Winchesters. But this is the least of their problems. The Lightwoods also walk directly into the path of the angel Castiel. And he's determined to find out what happened to his brother, Raziel.