Land of no Return

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.

In 1990, a group of hunters visit  Mount Elgon to illegally hunt a rare breed of monkey, they vanished without a trace.
In the year 2000, an Australian family visited Mount Elgon on a tour. Two of the children were found in a cave traumatized.
Susan N. N. Williams is a graduate student under Jones Harrison, professor of History. Jones Harrison together with Susan and his team undertake a tour of the caves under Mount Elgon. The meticulously planned event is disrupted when the company is trapped in a cave shrouded in mystery and myth, but they must first evade the mysterious hunters after them. For one member of the group holds the key to their survival.