The Deep by Alma Katsu

From the acclaimed and award-winning author of The Hunger comes an eerie, psychological twist on one of the world's most renowned tragedies, the sinking of the Titanic and the ill-fated sail of its sister ship, the Britannic.
Someone, or something, is haunting the ship. Between mysterious disappearances and sudden deaths, the guests of the Titanic have found themselves suspended in an eerie, unsettling twilight zone from the moment they set sail. Several of them, including maid Annie Hebley, guest Mark Fletcher, and millionaires Madeleine Astor and Benjamin Guggenheim, are convinced there's something sinister-almost otherwordly-afoot. But before they can locate the source of the danger, as the world knows, disaster strikes.
Years later, Annie, having survived that fateful night, has attempted to put her life back together. Working as a nurse on the sixth voyage of the Titanic's sister ship, the Britannic,...

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