Twilight Velvet is an experimental and theoretical magician working at the University of Canterlot.

Nightlight is an archaeologist, studying the remnants of ancient civilisations in distant lands.

Comet Tail, an astronomer at the Lunar Canterlot Observatory, binds the two together in his final act.

Years of correspondence concerning these ponies is compiled.

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This is rated teen because a main plot-point involves suicide and depression. Also some swearing.