Triton

The Children of the Sea is a cult which offers its members sex, drugs and freedom. The freedom is absolute, as long as each member obeys the charismatic cult leaders.
Peter is the son of those leaders. He is also one of the few who dislike the violence which is used to control cult members. When he escapes, he hides his identity so as to avoid vicious revenge from the cult.

When Peter is finally found, he is asked to help other cult escapees to discover the secrets of the long-disappeared cult leaders.

One of the drugs, "Water" has given its users a extended long life. Peter and his own baby daughter are infused with the drug. Without the drug, all of the cult members are now dying. Only Peter can understand his parents' cryptic clues. He follows the clues to the source of the Water.

The remaining cult members need the drug. Without the drug, Peter's own child will soon die.

They travel to the island of Atlantis. On the island Peter's parents, the missing leaders of the cult have set lethal traps. They are protecting their drug. They also wish to kill Peter, in punishment for his escape from the cult.