So far it was easy to recognize the tone--from " Daddy-Long-Legs" and " Molly-Make-Believe, " sprightly and sentimental epistolary collections enjoying a vogue in the States.
His first thought was of some dark menace from abroad; then he reflected that he did not know her epistolary style, and that it might run to picturesque exaggeration.
There was no need to mess it up with bells and whistles, although I did add a number of epistolary interludes (passages from fictional books, a diary entry, letters, teletype bulletins) between narrative segments.