Murder on St. Nicholas Avenue (A Gaslight Mystery);

The author of Murder in Morningside Heights returns to nineteenth-century New York City to find Christmas in the air, a police detective and a midwife with love in their hearts, and a wealthy widow accused of murder…
 
Detective Sergeant Frank Malloy and Sarah Brandt aren't the only ones who’ve recently tied the knot. Family friend Mrs. O’Neill was delighted when her daughter, Una, wed the seemingly wealthy and charming Randolph Pollock. But there’s a problem. Una was found cradling her dead husband’s body. Rendered mute by the ordeal, she cannot explain what happened and now stands charged with murder.
 
Mrs. O’Neill would like Frank to investigate the case and save Una, yet with Frank and Sarah still on their honeymoon, it’s up to the other members of their newly formed household to do some detective work. But solving the mystery behind Pollock’s death means first discovering the truth about who he really is…