"Titanic Voyage from Drumshee" is another good little book. It is told from the POV of a young girl employed as a governess for two children. All three are orphans, which has some to do with the dynamics of the story.
It is more geared (I think) to young girls; it has only a couple places that stretch the imagination, and with an ending that has the girl and her two young charges trapped on the stern of the ship, is one that leaves you guessing until the end.
I reviewed this book for "The Titanic Commutator" last year -- I don't remember the issue, however.