When an educational safari goes wrong, five teens find themselves stranded in the Kalahari Desert without a guide. It s up to Sarah, the daughter of zoologists, to keep them alive and lead them to safety. But soon they encounter something even Sarah cannot believe: a silver lion, as though made of mercury, makes a vicious, unprovoked attack on the group. After a narrow escape, the group uncovers the chilling truth behind the lion s silver sheen: a Corpus-manufactured, highly contagious and deadly virus that threatens to ravage the entire area and eliminate life as they know it.