Katherine Schneider's workaday life as a dentist in 1913 New York is upended when a patient reveals details of a deadly plot while under the influence of laughing gas. As she is plunged into danger, she seeks help from the dashing Lieutenant Jonathan Birch, a police officer she has long admired from afar.
Jonathan has harbored powerful feelings toward Katherine for years but never acted on them, knowing his dark history is something she could...