Never deceive a viscount

"Clearly, Emma Trafford's new neighbor is a lady killer--but is the scoundrel with the scar capable of murder? Emma can barely contain her precocious younger sister, Lily--the child swears she spied their neighbor engaged in foul play in his Bloomsbury love nest. But when Lily goes too far searching for "evidence," Emma must save the imp by distracting Simon--with an all-consuming kiss rife with danger and desire..."--