Guardian of the Horizon is by Elizabeth Peters. The sixteenth installment in the Amelia Peabody series. This novel is set in the time period before the start of WWI. The Emersons are summoned back to the Lost Oasis, supposedly to assist Tarek with a mysterious illness. Things are never what they seem with the Emersons however, and when they arrive they discover they have been lured back into the middle of a civil war. Fans of the series will enjoy this book and still be hungry for more of the Emerson clan.
Ratings: 8th grade - 9 out of 10 - P (profanity) - AC (some mature thematic content).