| This is a novel by C.S. Lewis, the second novel of his Space Trilogy. Although it is deeply Christian, it may be enjoyed by science fiction readers who do not share the author's beliefs, so long as the references do not make the reader actively uncomfortable.
The protagonist's last name is Ransom, and he and others are often called by their last names. Although this is a sequel, the reader will soon come to understand that immaterial beings called the Oyarseru have had experience with him in the past and have placed some trust in him, which is all you need to know to avoid confusion. Ransom is transported to Venus, where a new man and woman have been created, and are in danger of falling as Adam and Eve once did. It is Ransom's task to resist the evil by whatever means he can muster. | 
