Looking for a story of African prisons

Some time ago I found a story (maybe its title was THIRD WORLD ?) about a girl who is compelled by her boss to accompany him in a business travel in an African state.
Down there, she is arrested because her boss smuggled diamonds and is very badly treated in her prison.

The story had a second part, where she had finally come back to England, but was forced to come back for the trial, and was eventually condemned to be a prisoner in a village with hundreds of guys who rape her continuously.

Maybe someone recalls this story and can tell me where I can find it again?

Thanks.

Moana

eBook Bush Slave -by- Lia Anderssen

ISBN: 1-897809-37-9

Once again, Lia Anderssen introduces us to a lovely, innocent young heroine to whom pain and humiliation brings ultimate pleasure. Sold into slavery in Africa, Lisa Carling is kidnapped en route by rebels, and sold to a tribal chief who uses her as a sex slave for his warriors. Finally Lisa realizes that the arousal her treatment brings is what she desires, and slavery is her destiny.

Book II is also their!!