Aha! Um Rastro de Memória de Keith Laumer.
Uma das resenhas da Amazon menciona que era
originally serialized in Amazing in 1962 and published in book form the following year.
A descrição do Goodreads inclui esta sinopse:
Foster has hired Legion to help him regain his lost memory. Then both men are suddenly attacked by alien powers. They flee to Stonehenge in England where they discover a strange control chamber deep in the ruins.
E aqui está uma revisão mencionando a espaçonave sob o aspecto de Stonehenge e retornando ao planeta natal.