Ralph is retired. He tells himself he doesn't want to work because his family insists he doesn't work, but his wife's passing leaves him empty inside, so why not investigate what this strange species is?
As usual, Ralph's investigations become dangerous and are filled with adventures. His grandson, who he has been grooming to take his place against his daughter's wishes, secretly helps him on this new adventure. A creature that is rarely seen and that usually stays in the black depths of the sea, a creature made from chemosynthesis, decides to wreak havoc at the ocean's surface.