The Midwich Cuckoos - John Wyndham

Despite being set the book to read as a school text — virtually guaranteed to put you off any book at all — a story in which malevolent children developed a power rivalling that of adults was always going to catch a youngster’s attention.
 
Aliens assuming the form of ordinary girls and boys with weird telepathic and telekinetic abilities was fascinating and deeply unsettling.
 
I didn’t know it at the time, but a love affair with the powerfully imaginative storytelling we call science fiction and fantasy  was just beginning.