No Immunity Kiernan O'shaughnessy Mystery Series, Book 4.

When two immigrant boys die of a brutal and mysterious illness, Kiernan must fight to prevent an outbreak Deaf and incapable of speech, the two children from Panama are unable to voice their suffering, but Grady can tell they are dying. When he met them in the jungle they were miracle workers, soundlessly leading him and his team to the richest geological find of the century, and he brought them back to Las Vegas to safeguard his investment. Unwi...