In this fast-paced adventure novel for young adults, the Navy officer fathers of Caroline Connery and her friends mysteriously disappear during a top-secret submarine mission. An anonymous text message reveals a government cover-up and the possibility that their dads might still be alive. With the help of her retired Admiral Grandfather, Caroline and her friends steal a nuclear submarine to mount a rescue operation. With the entire Navy Pacific fleet chasing them, their mission reaches the breaking point when they come face to face with the evil Underworlders. Now our young heroes are all...