Book excerpt: A wildly popular app that feeds on hatred; a trek that literally brings out the beast in man; a luxury resort you don't want to visit on a new-moon night; a swimming pool with a deadly secret. These fiendishly unnerving tales by best-selling authors David Hair, Ranjit Lal, Deepa Agarwal, Murdering ghosts, enchanted amulets, a haunted medical school, an uncle with a resemblance to a vengeful lion...all these bring the paranormal uncomfortably close. Read if you dare..