Edith Nesbit 
In the Dark 

Nice, moody, horror story. Two best friends are bedevilled by a third friend, who haunts them from grade school to adulthood. He seems to intuit things he can’t know, and always tells the truth. One friend escapes to India to get away, the other stays in England. When the escapee returns, he finds his friend shattered and half-mad. Why, is the story.