A shocking event convinces Keith that he has to risk arrest to protect their Bradley Central students. A stranger questions their Britomartis findings and only a trip to Pakistan will solve a new mystery -- that of the daughters-in-law of Noah. Cherub Rider has a mission Keith isn't sure he can go along with -- protect Keith at all costs, even if it means leaving Talia behind. They have to depend on the mysterious ancient amphibian skin for a totally unexpected, possibly lifesaving, mission. Is the Morse Code message tapping ALIVE real? Is a bag of gray dust the end of all their hopes to prevent the Great Thirst?