The Dark Tunnel

"The Dark Tunnel" is a 1944 spy thriller novel written in by Ross Macdonald.

University professor Robert Branch makes light of his best friend's suspicions that there's a Nazi spy in their sleepy, midwestern university town. He's more interested in the fact that his ex-girlfriend from Germany is about to take a post at the university. But then his ex turns out to be rather mysteriously engaged to the son of the German professor and he watches his friend fall to his death out his own office window Robert's the only one who thinks it isn't suicide. And when he attempts to expose the killers, no one believes him. And he finds himself running for his life, marked as their next target.

Millar wrote "The Dark Tunnel" in one month at Ann Arbor in 1943, while completing graduate work at the University of Michigan.

This book was reprinted by Lion in 1955 under the title "I Die Slowly".