In this sequel to "Double Helix," a university geneticist is joined on an alien spaceship by his son, his son's girlfriend and six students. The aliens promise a great experiment in hope, but the students may find they have been led astray.In this sequel to "Double Helix," a university geneticist is joined on an alien spaceship by his son, his son's girlfriend and six students. The aliens promise a great experiment in hope, but the students may find they have been led astray.