The Key

A scientist flees Germany—but meets death in a little English village: From “a first-rate storyteller” (The Daily Telegraph).
  Michael Harsch’s life has never been easy. A German Jew, he fled his country when Hitler came to power, escaping the concentration camps by the skin of his teeth. His wife and daughter were not so lucky, and he vowed revenge on the Fuhrer through science. He set to work on a marvelous new explosive that, in the hands of the British army, could silence the German guns forever. But on the eve of his great triumph, the scientist is struck down. The government asks Miss Silver, the dowdy detective, to help solve the murder and recover the valuable explosive. Was Harsch killed by a half-mad opponent to the war effort, or was it one of Hitler’s undercover agents who pulled the trigger? 

• The Clock Strikes Twelve (The Miss Silver Mysteries Book 7)
• Dark Threat (The Miss Silver Mysteries Book 10)
• She Came Back: A Miss Silver Mystery Series, Book 9 (The Miss Silver Mysteries)
• Wicked Uncle (The Miss Silver Mysteries Book 12)
• The Catherine Wheel (The Miss Silver Mysteries Book 15)
• Latter End (The Miss Silver Mysteries Book 11)
• Miss Silver Deals with Death (The Miss Silver Mysteries Book 6)
• Eternity Ring (The Miss Silver Mysteries Book 14)
• Death at the Deep End
• The Chinese Shawl (The Miss Silver Mysteries Book 5)