In The Camden Girls series, the family patriarch runs one of the first subway systems in London. Each girl has her own challenges to find love and contentment after a horrific tragedy threatens to ruin the family name.
There are three books in this series, book one is about the eldest Camden girl, book 2 is about her cousin, and book 3 is about the youngest sister. They--and their reading order--is as follows:

(Camden Girls, book one)
Synopsis:
Heartbroken after being jilted in front of friends, Honorine Camden throws herself into preparing a party for her father’s new underground railway station. At his request, she works alongside his charming, completely off-limits, assistant stationmaster, Shane MacIntyre, and slowly, her heart begins to thaw… until a tragic accident threatens everything she’s come to cherish.
Setting: Outside London, 1879
Meet Honorine and Shane here.

(Camden Girls, book 2)
Synopsis:
Edwin Hetherington needs a fiancée, not a wife.
Years ago, his Irish family lost everything to an unscrupulous landowner–including the family title. Now, the elderly scalawag offers to make amends if Edwin weds Miss Jera Camden. As far as Jera is concerned, so long as she manages to avoid marriage to a certain Scotsman, the bluestocking is delighted to pose as Edwin’s blushing bride-to-be. Can Edwin and Jera dupe the old codger into honoring his promise before the wedding date arrives … or will their clever scheme result in wedded disaster?
Setting: Outside London, 1880

(Camden Girls, book 3)
Synopsis:
Fresh on the heels of romantic heartbreak, Miss Isabelle Camden agrees to become companion for the sister of a busy, arrogant duke. She plans to keep her distance, but when a snowstorm strands them outside London for days, an unexpected dare sets propriety at naught…and sends her into the duke’s arms.