* CliffHanger: At the end of ''Shadow Study'' Yelena still doesn't [[spoiler:have her magic back]]...and then realizes that [[spoiler:she's pregnant.]]
* NightmareFuel: Yelena and Opal have some pretty awful dreams about their past experiences.
* ShowDontTell: Maria V. Snyder's style is occasionally a bit awkward, and sometimes veers into this.
* ProfessionalKiller: Valek's former profession, and arguably still his job after the Commander's takeover of Ixia. Killing isn't his only job as he also serves as TheSpymaster, but it is something he's called upon to do quite a bit.