30 years ago Dr Clifford McBride and his crew set off on an expedition to Neptune. At a point all contact was lost and the expedition is assumed to have failed. Now, life in the Solar System is under threat as strange energy surges are experienced, caused by activity on Neptune. US Space Command is convinced that McBride is behind this and sends McBride's son Roy, a highly competent and experienced astronaut, to Neptune to seek answers.—grantss