We Give a Squid a Wedgie — C. Alexander London

If Oliver and Celia Navel had any hopes this year would be less life-threatening than the last, their hopes are quickly shattered…along with their television set. When a strange scientist warns them that their mother is -- yet again -- in peril, it's off to the Pacific Ocean they go. But navigating stormy seas proves easy compared to tackling a Kraken -- an enormous squid -- and the twins think they might have bitten off more than they can chew. In their quest for Atlantis, Oliver and Celia are in the worst trouble of their young lives; and survival comes down to one seemingly impossible task: giving a squid a wedgie.