Book III of Timothy ‘Tiger’ Clinton.  Taking a break from Biggles…An encounter with an amazing scientists named Professor Brane has led Tiger Clinton and his young son Rex to join the first group of humans to penetrate the unknown vastness of space. Their journey now takes them beyond the inner plants of the solar system to confront the mystery, adventure and deadly danger that awaits on the alien worlds beyond the stars.  Cover art  by Bob Fowke.