Grace, Grant's sister, comes to visit the Robert family much to everyone's displeasure. It is especially hard for George who left her.

Joyce is readying to leave Danger Bay behind her but when the Roberts are taken hostage she has time to think it over.

George and Grace worry about the Roberts and go to help them meanwhile Joyce has to contend with other problems.

A training survival course proves to be more than Nicole wants when things go wrong.

While J.L. is flying her plane she encounters a storm which leads to her crashing. On board the plane were Grant and George who were injured. Back in Danger Bay, Grant's children and Grace must face the possibility that the search party may not find the missing men.

The annual bathtub race arrive in the strait of Vancouver and Nicole and Jonah want to enter. The adults see the possibility of getting extra sponsors for the aquarium. With three new sponsors and three new bathtubs a rough ride awaits Jonah, Grant and J.L.