"Speaking with his novelist friend Paul Bourget, prior to writing Le Horla, Maupassant confessed that he frequently encountered his own double, and while he repeatedly assured himself that it was pure hallucination, he recognized that his mind was starting to slip." By Aaron Dabbah.

Doppelgangers are a pain in the ass. They have no respect for your personal space. Preternatural apparitions do badly in job interviews, so they are universally unemployed, leaving them ample free time to screw up your work and scare the neighbors...

As Dublin City University student Niamh Geaney finds her twin stranger through social media in just 16 days, Sarah Knapton investigates the science behind the unsual coincidence.

Gothic horror / science fiction. A plague of doubles in the British corridors of power.

One is from Mary Shelly, author of Frankenstein.