Lewis is offered a great job with a marine biologist, but the girls are concerned that his interest will cause him to reveal too much information

It's time for Emma's family's annual vacation trip, but she can't go as the risks are too high. But all her excuses don't go very well with her family. Meanwhile, with the return of Dr. Denman, Zane is closer than ever to cracking the girl's secret.

Dr. Denman sets up a trap for the girls at Mako Island and Zane is forced to decide who he should be helping.