1923: Niagara Falls, Canada. Evangeline Murray, a young widow from Ohio, is recruited by the Women's Freedom Movement to recreate the daring 1910 feat of Annie Edson Taylor, the first person in recorded history to plunge over Niagara Falls in a barrel and survive. Evangeline believes that the stunt will bring her fame and fortune, and freedom from her late husband's gambling debts.
Joshua McClaren, an enigmatic, battle-scarred veteran of World War One, reluctantly agrees to launch the headstrong Evangeline. Joshua has seen hundreds of bodies surface in the whirlpool below the falls, and has no wish to see the charming Mrs. Murray suffer the same fate. Before the barrel can be launched, Joshua and Evangeline will each confront their own demons. Hearts will be broken, painful secrets will be revealed, and the Niagara River will claim two more lives.