Best mystery recommendation needed..please!

I'm about to take a very long holiday train ride and need a great mystery to read. One that will make the hours melt away and keep me distracted from thoughts of the upcoming family slaughter.
What is your favorite and thank you for taking the time to respond.

Gaudy Night by Dorothy Sayers

The Journeying Boy, Michael Innes
Mystery Mile, Margery Allingham

How about The Name of the Rose? Should keep you absorbed for the train journey and give you somewhere to retreat to when the family start getting on top of you.

Sculptress by Minette Walters
Murder on the Orient Express by Agatha Christie
Silent in the Grave by Deanna Raybourn
Daughter of Time by Josephine Tey
Crocodile on the Sandbank by Elizabeth Peters

Mistress of the Art of Death by Ariana Franklin

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Oh, yes.

Thanks for taking the time and all the suggestions...