«The Blue Lights» by Frederic Arnold Kummer

In this detective novel — an American millionaire's son has been kidnapped in Paris. They want desperately to include detective Duvall in the investigation. _x000D_ Frederic Arnold Kummer (1873–1943) was an American author, playwright and screen writer. He wrote in various genres including spy and international mysteries, detective novels, romances and non-fiction. Under the pseudonym Arnold Fredericks he wrote a series of mysteries featuring the detective Richard Duvall._x000D_ _x000D_