When I was a kid, I remember reading a book about a boy who lived with his father in an undersea research station. The boy's father was a biologist and had genetically engineered the boy a pet dolphin. He was also doing some research into some transplanted Martian lifeforms. Anyway, the father had to take a business trip and hired a bodyguard to watch the boy while he was away because there were political factions (I think that they called themselves the Vandals and were identified by the long beards they grew) who were against the concept of studying Martians on Earth.
The story played out with the Vandals taking over the research facility to kidnap the boy. The bodyguard, whose name was Lilliburlero (sp?), evacuates the boy but they wind up getting caught. However, the cavalry arrives and saves the day in the end.
Anyway, if someone has the name of the book and the author, that would be most helpful. I'm trying to find it at my local library so that my kids can read it.