Shadow Child, Citro's first published novel (but written after Dark Twilight, aka Lake Monsters) is a decent enough chiller, though I wish the "big baddies" weren't made known so early on, as that took away from the whole "fear of the unknown" aspect I enjoy when reading horror. Still, there were plenty of creepy moments in this story about a man who returns to his woodsy, mountainous hometown in Vermont -- where strange disappearances and mutilations have been occurring -- for the first time since he was a child.
The writing is nondescript and no-frills, but gets the job done, despite some awkward sentences here and there. The story just had a feeling of treading water at times, as almost right away it's pretty obvious to the reader what's going on, yet it's necessary to plod through hundreds of pages waiting for the characters to get caught up. But the descriptions of the horrors taking place in and around the surrounding woods are very well done, and are intercut nicely with the scenes of normal domestic life. Just when I'd start to get comfortable, but before I started to get bored, a chapter would come along that would send serious chills down my spine.
Overall, this was an average to slightly above average horror novel, a pretty typical example of late 80s horror. As big a horror fan as I am, I haven't read too many Zebra novels, as I'd always been under the impression that they specialized only in Grade-Z horror, the last resort for writers who couldn't get published elsewhere, but that certainly wasn't the case here (just like it wasn't with Lansdale's Act of Love, Laymon's The Stake, and Edward Lee's The Chosen, all recent Zebra reads that were pretty decent, imo). I especially liked Citro's use of real New England folklore and ancient ruins, which added a bit of verisimilitude.
I wouldn't go out of my way to track this down, but if you come across it, it may be worth checking out if you're in the mood for a "supernatural threat in the woods"-type novel*. Plus, the cover is delightfully tacky, yet oddly creepy in a way, a notch above most of the cheesy Zebra covers from the era (though as mentioned elsewhere, the cover image has nothing to do with anything).
*One of the best of this type from the horror-boom era that I've read recently was T. Chris Martindale's Where the Chill Waits.