Just finished rereading Hoax by C. L. Stone, which is the 5th book in her Scarab Beetle series. This book picks up where Accessory leaves off, so Kayli and Blake are still stranded on land while everyone else is on the cruise ship trying to help Ethan. Now not only does Kayli need to find and stop the investor, she has to find a way back on to the boat and back to her Academy guys. Give this series a try, it is addicting!