Harry Harrison 
Rebel in Time 

Colonel Mc Culloch was up to no good. That was becoming very clear indeed. He had stashed away a quarter of a million dollars in gold, and was a prime suspect in a couple of murder cases.But secret agent Troy Harman can find no trace of his whereabouts. Mc Culloch has vanished into thin air.When Harman visits the research station where Mc Culloch worked as security chief, he realises the awful truth.To follow Mc Culloch, to try to put an end to his insane mission – Troy Harman has to embark on a strictly one-way trip . . .