Lusitania

If Titanic was the Ship of Dreams, Lusitania is the Stuff of Nightmares.

Carrie Boxhall is happy to help her mistress, Meg Ashton, when she needs someone to return to Britain on her behalf. Even Meg's tumultuous crossing on Titanic and a warning from Ruth, the little girl who seems to know things she couldn't possibly know, doesn't deter it.
Meeting a handsome stranger aboard the ship is an added bonus. By the time the coast is in sight, Carrie is looking forward to a bright future full of love.
But then her entire world is rocked when the ship is hit by a torpedo. Eighteen minutes--that's all they have to escape the floundering ship. Will Carrie and her new friends make it out alive? Or will she find herself tossed into the frigid sea?

Lusitania is the fourth book in the Ghosts of Southampton series.