Casey Wilson and Sam Altair are strangers, but a botched experiment in time travel has thrown them together with no one else to turn to. They are trapped one hundred years in the past, on the streets of Belfast, Ireland in 1906. With their old lives lost forever, the young college girl and elderly physicist must start over, knowing that every move they make could change history in countless ways. But a famous tragedy becomes personal when Casey meets Thomas Andrews, the man who will build the doomed steamship, Titanic. In love with Tom, and determined to save his life, Casey will do everything she can to prevent history's most notorious maritime accident.