relative to the other likewise the use content transportability and size of space are irrelevant to the principles application meaning and function of the presently disclosed invention also it will be understood by a person of ordinary skill in the art that doors are commonly made to have both left and right hand openings depending on the application and therefore the configuration shown in the attached figures may be reversed in fig1 enclosed lock device 50 is shown generally from a top view in this figure a latch box 60 cooperates with a strike box 120 to securely lock first door 10 to second door 20 fig2 is an isometric cut away view of a preferred embodiment of lock device 50 fig3 is an isometric explosion view of the embodiment of fig2 in fig2 it is seen that latch box 60 forms an enclosure having a backplate 64 for attachment of latch box 60 to first door 10 or doorframe wall or other stationary element not shown in this view in a preferred embodiment latch box 60 has a baseplate 66 attached to the bottom of backplate 64 baseplate 66 has a lock slot 68 in the less preferred embodiment there is no baseplate 66 and the opening at the bottom of latch box 60 constitutes lock slot 68 in a preferred embodiment latch box 60 also has an end plate 70 in this embodiment end plate 70 has an upper slot 72 in a more preferred embodiment end plate 70 also has a lower slot 74 a guide bar.