Transformed: Paris (Charley & Electra #2)
Suzanne Falter, Jack Harvey

Meanwhile, she and Charley begin having love troubles when he suggests opening up their relationship to suit his pan-sexual desires. After discovering that he may have been fooling around with his attractive new male assistant, Electra moves out in a huff. Soon Charley is wandering the quays alone, trying to find the dirty bombs while wistfully longing for his love.
Electra enlists the help of Dickie’s feisty eighty-something milliner, Odile, to break up the plot. But then suddenly, Electra disappears. Now Charley must search frantically for both the bombs and Electra amidst the cafes, conversation, and the gleaming, rainy streets of Paris in winter.