Oathbreaker — Marion Zimmer Bradley

Dyan Ardais has already taken the monitor's oath when he is summoned home from Arilinn because his father has just killed his stepmother. The oath binds him not to use his poweres to force his will on another. But his father is insane, obviously dangerous to those around him, and totally unwilling to listen to reason.

This story was previously published in the Darkover anthology MZB's DARKOVER, Oct 1993.