Marathe and Steeply: disguises

Dropped flat between two beats of tradecraft talk: the A.F.R.'s audible signature, seeded. The "very slightly" squeak recurs under the whole mountainside serial (072, 088, 101, 123) and finally becomes terror outright in 121's "madly squeaking brass-colored blur"; Carlisle's squeak-omen linkage ("to hear the squeak" as danger-warning, 069/169) hangs off this sentence.