Midsummer Moon — Laura Kinsale

LOVE'S MAGIC...
Lord Ransome Faloner's mission was to find the inventor whose new discovery could defeat Napoleon's forces. Never did he expect that the genius would be lovely young Merlin Lanbourne, a woman more brilliant that all the King's men...more bewitching than any court lady...

Intoxicated by her innocent beauty, Falconer falls under a spell of passions he can't control. Claiming the mysterious Merlin with kisses, he carries her back to his estate, mindless of the scandal he is creating. But danger pursues them, and as Falconer risks his life to save her - using one of her own inventions - they are swept to new heights of adventure, and a magnificent triumph of love...