Summary:

drone, noun
i) a male insect in a colony of insectsii) a remotely-controlled craft or missile, generally unmanned and used for combat purposes
iii) a tone, usually one note, that is carried throughout a song beneath a melody

Imperial Agent Cipher Nine and the Killik-altered diplomat Vector Hyllus occupy highly unique positions within the galaxy - and their struggles to understand those positions continue to draw them closer together.

[Covers from Taris (early/mid Chapter 2) through Chapter 3; some references/flashbacks to Chapter 1 events; Spoilers!]