Automatic flush bolt latch means for one of a mating pair of doors, so constructed and arranged that, when both doors are closed, said one door is affirmatively locked, that when the other door is even slightly opened said one door will remain latched but with its latch means readily retractable by the application of gentle opening force to said one door, and that said latch means, when once retracted, will remain so until both doors again assume closed positions, no matter which door closes first, whereupon said one door will again be affirmatively locked for so long as said other door remains closed.