Why Tamara and Dgrace...! Those are MY recommendations, too! I'm so glad to see others recommending those two wonderful stories! Also, dear reader, try:
"Touch Not The Cat" by Mary Stewart. A young royal ******* named Merlin begins to develop strange powers and prophesies. He soon meets his royal uncle, Ambrosia Pendragon, and they begin to plot to put young Arthur, son of Uther Pendragon, on the English throne.
"The Stand" by Stephen King. Seen by many as King's best work, this tale is of a bio-weapon that kills 99% of the world's population. In America, that would leave over 3 million people, who miraculously begin to experience two strange dreams: one of a little old black lady in a cornfield, and a dark, laughing man in Las Vegas.
"Stranger in a Strange Land" by Robert Heinlein. A flight to rescue a failed Mars mission yields a human who was raised by Martians, and who has strange and wonderful powers. He's brought back to Earth where he begins to interact with the humans all around him. A classic!
"Slaughterhouse Five" by Kurt Vonnegut. A WW II veteran and former POW (Prisoner Of War) has become unstuck in time, and can never tell where, or when, he'll find himself. He keeps experiencing the terrible fire-bombing of the open city of Dresden in WW II where over 75,000 (white European) Germans were burned alive!