Saving the Scientist by Riley Cole

A woman who disdains love collides with a man who lives for passion. Explosions ensue.
Ada Templeton believes in science. She believes in chemical reactions and experimentation and old-fashioned common sense. She’s far too clever to be seduced by a rake like Edison Sweet.
Con artist, liar, self-taught inventor, Edison Sweet, uses his hard won skills to help others. When he’s not saving unfortunates swindled by Victorian London’s criminal classes, he loves women. A great many woman.
Over Ada’s objections, Edison agrees to guard her latest invention from a mastermind willing to kill for it. He never expected to be intrigued by the lovely widow whose body he finds as exciting as her mind.
Their chemistry is impossible to ignore.
And impossible to trust.
Stalked by a brilliant killer, will they concoct a formula powerful enough to mend two broken hearts, or will love elude these two stubborn inventors?