An enemy's vengeance from the grave traps Mortimer out of time. Professor Mortimer is bequeathed an old house in France by a former adversary: Miloch, the evil genius of SOS Meteors fame. Along with the house is a letter inviting the Briton, as the only man of worthy intellect, to discover a fabulous invention left behind by the departed. Following recorded instructions, Mortimer activates the device ...and wakes up a hundred million years in the past! Thus begins an incredible odyssey through time...Captain Francis Blake, dashing head of England's MI5. Professor Philip Mortimer, world-renowned nuclear physicist. The most distinguished duo of gentleman-adventurers, battling the forces of evil and their arch nemesis Olrik around the globe, below the earth, even across time itself...The 19th adventure of Her Majesty's finest protectors!
This is book 19 from the series.