The Servants of Twilight Dean R. Koontz 1991
To his mother, Joey seems an ordinary six year old boy, special to her, but to no one else. To the Servants of Twilight, however, he is an evil presence who must be destroyed, an Anti-Christ who must die.
The terrifying ordeal for Joey and his mother begins in the supermarket car park where an old woman accosts them and pursues them with her terrible threats.
Christine's world is turned into a nightmare of terror. Only her love for her child, and the support of the one man who believes her, gives her the chance to survive the Servants of Twilight...
This book was originally published under the pseudonym Leigh Nichols.