Moonstone Mystery Romance #6 When Darkness Falls by Barbara Corcoran, 1985

Keeping tabs on a pack of ten-year-olds isn't the easiest job Julie's ever had, but working as a camp counselor has its rewards, too.  Like meeting Mark, the tall, blue-eyed hiking counselor who seems as nice as he is good-looking.

But then Pat, one of Julie's campers, suddenly disappears, and Mark turns cold and distant.  He's hiding a sinister secret behind that charming smile, and it might have something to do with Pat.  If only Julie can discover what Mark is up to - then she can be sure that Pat, and her own heart, are safe. 

I mentioned in two of my other reviews that I looked for anything that could refer to Nancy Drew or other series books as I read through this set, since the title of the series appears to be a nod to the Nancy Drew book, The Moonstone Castle Mystery.

I found several names in this book that might or might not mean anything.  Bungalows are mentioned.  Some character names are Dana, Joe, and Aunt Harriet.

This is a suspenseful and very good book.