Twins Marty and Grace O'Hara are thirteen years old. Marty is athletic, artistic, a great cook, a troublemaker, and has a photographic memory. Grace is quiet, observant and smart. A Mokélé-mbembé egg found by Dr Laurel Lee was stolen during a break-in, but Lee was able to break in to Blackwood's GeneArk lab and steal it back, leaving no time to find her notes. Wolfe tells Lee that he and Blackwood are arch-enemies, and that he concocts lies and fools the audience with his on-TV persona. Marty and Grace find the eggs in the nest of Mokélé-mbembé, and take them back to the skyhouse.