Abstract: A locking system for a door for use in conjunction with a commonly available locking mechanism has an interconnecting rod attached to one end of the primary sliding bolt of the locking mechanism, and at the other end to a pivoted link. A draw bar extends from the pivoted link to other pivoted links that are each attached to an additional sliding bolt. As the primary sliding bolt is extended outwardly from the edge of the door via the locking mechanism, the interconnecting rod communicates this motion via the pivoted links and draw bar to each of the other sliding bolts, thereby causing these sliding bolts to extend from the edge of the door in a like manner. Similarly, as the primary sliding bolt is retracted, the reverse process occurs and the secondary sliding bolts retract into the edge of the door.