Don't know a thing about this author, Laird Koenig, but I'm sure everyone is familiar with The Little Girl Who Lives Down the Lane (Bantam 1975), which of course was the basis for the Jodie Foster/Martin Sheen flick. Using my Google-fu I track down the cover art for his other paperbacks, which feature imagery that invoke mystery, romance, thriller, and that kids-in-danger scenario (accompanied, of course, by a nursery-rhyme title) so beloved of mainstream readers. Islands (Dell 1980) is pretty cool, a nicely rendered bit of moodiness with an unexpected reference to Dickey's Deliverance. Rockabye (Bantam 1983) exploits a common fear, but the blue glow seems to add an otherworldly twist.
Let's Go Play At the Adams'. The predatory imagery of The Disciple (Bantam 1983) implies more than discipleship. Man what were they thinking in those days?