REVIEW: The Berlin Letters by Katherine Reay

From the time she was a young girl, Luisa Voekler has loved solving puzzles and cracking codes. Brilliant and logical, she’s expected to quickly climb the career ladder at the CIA. But while her coworkers have moved on to thrilling Cold War assignments—especially in the exhilarating era of the late 1980s—Luisa’s work remains stuck in the past decoding messages from World War II.

Journalist Haris Voekler grew up a proud East Berliner. But as his eyes open to the realities of postwar East German...