The Secret of the Coral Cave (The Rugendo Rhinos Series#9)

The Rugendo Rhinos Club boys are on vacation with their families in Mombasa. They make friends with Salim, whose father is a fisherman. A few days later, Salim’s sister disappears. Was she kidnapped? The boys believe she will be trafficked to the Middle East and sold as a slave. They stumble onto a coral cave near the beach where the traffickers hide their victims – along with some ivory. Will they catch the traffickers?