I'm currently reading The Night Land by William Hope Hodgson. A strange and dense novel written in 1912 detailing a man's journey across an earth of eternal darkness to rescue his reincarnated love from the 17th century. He's got a powered saw like weapon he uses to dispatch twisted soul stealing monsters. The remnants of humanity live in a gargantuan pyramid called the Last Redoubt. The novel is written in an overly stylized "17th century" fashion and features no dialogue as it's laid out as if it is his diary (of course).

The book I finished previously is called Brother Assassin by Fred Saberhagen. A man is tasked with traveling to key points in time to prevent the malicious machine intelligences called Berserker probes from using their own time infiltrators to disrupt humanity's past. Whether acknowledged or not I'm fairly certain that this is the book that inspired Terminator and not Harlan Ellison's Outer Limits episodes.