My interpretation is a little different. With the death of Hiram Abiff the Word is lost.
I understand your interpretation of the symbolism. I also agree with it being a story of loss. In actuality, all the Minor Arcana are expressions of Waite's meta-story of Loss, while the Majors are the story of Restoration—which Waite himself explains in
The Holy Grail:
"The same story of loss is told everywhere, though never in the same way. But a story also continues, from age to age, that somewhere, sometime, the missing Word, the key to our Existence, will be restored."
What I was describing is the fact that the cards are
literal illustrations of scenes in the Hiram Abiff story. Pixie did what she was trained to do—she illustrated stories told to her by Waite. The cards illustrate the story perfectly and in order. At this point in the story, the murderers attempt to escape by boat, which just happens to correspond nicely with the old divinatory meanings of travel over water.