Looking for a horror novel that takes place in Africa

[Sleepy]

It's to give to my sister as a Christmas present. Next spring she's going to visit Africa. Last year while vacationing in India, she read a copy I gave her of Dan Simmons's "Song of Kali."

http://img.dailymail.co.uk/i/pix/2008/02_03/africa2DM1902_800x507.jpg

Thanks.