Tony Park 
Far Horizon [EPUB ebook] 

An overland tour through Africa becomes a quest for revenge.
Mike Williams is leading a supposedly carefree life as an overland tour guide in Africa, but he’s carrying a burden of grief from his time as a United Nations landmine clearer in Mozambique.
The South African police are hunting murderous poachers and they call on Mike to help them investigate a new lead in an old crime whose circumstances Mike knows all too well.
British travel journalist Sarah Thatcher is along for the ride, with a bunch of fun-seeking backpackers, but Sarah is hungry for a hard news story and she’ll do anything to uncover Mike’s secret past.
Their safari holiday is about to turn deadly.