Dunnett's use of POV is extremely complex. It's omni, and in many scenes the POV is clearly focused through one character, but in many other scenes the focus is shifting and it's not always clear if any particular element is filtered through a character, coming through some different character altogether, or from an external narrator. And even when the narrative is filtered through a well-defined POV and you're apparently sharing a character's thought process and perceptions, you're not necessarily getting the whole of it. Characters keep secrets from the reader, and readers aren't necessarily given the information to detect when important things are being hidden from them -- although they may suspect it, and draw their own conclusions. (For example, when a major character in the protagonist's entourage whose POV was frequently used through many volumes of a series turned out to have been in fact a Secret Master Villain all along.)
IOW, Dunnett used omni/multi-character POV very skillfully to lie to the readers. She was, after all, very deliberately and explicitly playing a war-game with her readers, especially in her later books. The narrative was intended to be deceptive and hide what was really going on from readers who who were actively trying to penetrate the secret and untangle the truth.
This is very advanced technique. If you're not a true master, you shouldn't play this game. (And probably not, even if you are.)