Adella's Enemy — Jacqui Nelson

The War Between the States ended five years ago, but she still pursues her enemy...
Rebel spy turned government rabble rouser Adella Willows receives her mission straight from a Washington senator-play havoc with the Katy Railroad and derail its bid to win the race. The senator craves wealth. Adella craves revenge against the man responsible for her brother's death. But her plans crumble into chaos when she enters a battle of wits with the railroad's foreman.
An ocean separates him from his failures in Ireland, but he's still haunted by those who died...
Seasoned railroad foreman Cormac McGrady's sole desire is keeping his workmen safe and employed, which means keeping the Katy ahead of its rivals. But the beautiful spy bedeviling his railroad needs protecting as well. Cormac must choose between winning the race and winning Adella's heart, while Adella must choose whether she lives for revenge or dies for love.
Can the pursuit of an old enemy lead to a new love?
This novella can be read on its own or as part of the "Passion's Prize" anthology in the "Steam Romance and Rails" series.