Who said mermaids exist? A wonderful week of vacation - filled with city trips - is rudely interrupted even before Pinky can spend all her money on shopping. Pinky gets told that someone leaked information on the existence of the Aquiferians. The life of the recently discovered ocean people is in danger.
As it appears that some Aquiferians are also taken prisoners, Pinky and her friends need to take action; they must come to the rescue. Racing the clock they have to find out who could not keep his mouth shut about the recently discovered creatures. In their attempts to release and to save the Aquiferians, Pinky and her friends have to deal with unexpected situations and fight unknown enemies. Old friends suddenly are no longer friends; while new friends create more unexpected problems, tensions and... problematic romances.