The Missouri State Fire Marshals Office is investigating possible arson fire on Spring Hill Road. The Sunrise Beach Fire Protection District was called to the two story home off of Lake Road 5-39 at 6 in the morning on Saturday. The interior was fully involved on arrival and the blaze was upgraded to a first alarm. One firefighter was treated for heat exhaustion at the scene, no one was home, no injuries were reported. Sunrise Beach fire chief John Sullentrop said there was enough evidence within the fire to question the origin because the blaze burned so quickly.