In the eleventh book of the Alien Next Door series, Zeke's parents are off-planet, and Harris and Zeke are tasked with researching the ocean and its creatures--on their own!

It's time for summer vacation, and Zeke and Harris are excited to take a road trip to the beach! Disaster strikes when Zeke's parents are unable to take them at the last minute, but Harris's parents offer to take them instead. However, this means that Zeke and Harris will have to help Zeke's parents with their Earth research of the beach and ocean--all on their own. Will they be able to complete their undersea research without Harris's parents finding out?