Earl Simon runs a Cornish marine science institute near the coastal family estate with biologist Jenny Peters. Both are delighted when his son John, her ex, finally returns now his latest assignment as star architect is from mayor Albert Fine for a luxury hotel, yacht club and marina, but that requires the end of the plans for a dolphin reserve. Jenny Peters lives with grandmother Emily and makes up with John. Jenny's half-sister, ballerina Laura, visits with mystery problems. Emily's fatal cardiac problems bring in Laura's socialite vulture mother Olivia who seeks revenge for missing out on the family estate to the granddaughters.