The Portable Door

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The most ordinary clerks work in a very unusual firm. Here they solve the strangest accidents and search for magical artefacts. Unremarkable pair of trainees - the middle-rank performers, do not even suspect, in what got involved, and thinks only about how to deal with routine before dinner, preferably without changing the course of history and not plunging the universe into the chaos of temporal paradoxes. Otherwise, they will definitely not be promoted.  
See also