Abstract: A door lock has a fixed housing having a thin pie shape with a hinge sleeve extending from an edge and an extension containing a hinge opening. The hinge opening connects to a hinge of a door. A rotating housing has a thin pie shape with a hinge sleeve extending from an edge and aligned with the hinge sleeve of the fixed housing. A hinge pin extends through the hinge sleeve of the fixed housing and the hinge sleeve of the rotating housing. The rotating housing has a first position that is coplanar with the fixed housing and a second position that is stacked on the fixed housing. When the rotating housing is in the first position it blocks a door from opening. Since the fixed housing is attached to the hinge of the door, the door lock is as strong as the door itself.