The Devil's Horn — David L. Robbins

Inside South Africa's Kruger National Park, ranger Promise discovers the remains of a crashed military drone -- and a live missile. Immediately, Promise calls her uncle, Juma, a rhino-poaching kingpin and an illegal arms dealer. With Promise's help, Juma has kept her and her grandparents out of crushing poverty with illicit money.

Alerted US authorities send pararescuemen LB and Wally into the Kruger to secure the crash site. But Juma gets there first and takes the unexploded missile.

This ignites a race to find Juma's camp and then eliminate the evidence before the missile triggers an international incident. LB and Wally must join forces with disgraced Promise and her jaded, dangerous boss, Neels, who wants both Juma and Promise dead. This tense alliance sets out in pursuit of the stolen missile. But how much will Wally and LB be asked to risk so that others may live?