The Jigsaw

Strolling up and down a bustling outdoor flea market, a withered silver-haired man browses the tiny and humble stands, when unexpectedly, a shadowy, out-of-the-way cramped antique shop grabs his attention. In the first place, everything seems quite ordinary, but after a while, inside the gloomy, crammed with objects shop, the choosy customer will eventually dig out underneath a pile of dusty boxes, a worn-out, unobtrusive paper box of a jigsaw puzzle which bears neither a label nor a picture. Obviously, this is no ordinary item, so, anxiously and with eyes gleaming with desire, the eager, yet unaware buyer, after offering a small fortune, he will leave the shabby place ignoring the unwilling vendor's warning. Soon, as the man painstakingly puts the puzzle's pieces together one-by-one nearing its completion, somehow, reason's frail confines will be irreparably breached by sheer and undiluted man-devouring paranoia. What could the puzzle's sinister mystery be?