Tangled in Time by Pauline Baird Jones

Colonel Carey (from The Key and Girl Gone Nova) takes a test “flight” through the Garradian time-space portal, but an unexpected impact lands him somewhere and somewhen unintended. As he attempts to get to Area 51, he crosses paths with Miss Olivia Carstairs. With a mind as crisp and orderly as the stays of her corset, Olivia has a transmogrification machine powered by steam and lips he’d like to kiss like it was his job. Can he convince her to join forces with him before she shoots him with her derringer? Can they elude the villainous Professor Smith?