FBI agent Bob Reynolds uses Muirfuild beast Eddie Long to eliminate people by arson, causing a terrifying wave of fires. Realizing it best takes a beast to beat one, Gabe seeks Vincent's help. They and Cat work with the fire department investigators, the junior of which triggers Vince's memory: it's Aaron Keller, the son of his killed big brother William, whose temper and zeal put him in great danger.
—KGF Vissers