The Poisoner's Piece summary:

Raised as a poisoner, Teagan has his target: kill the sickly king of the southern kingdom. It should be simple. Posing as a physician, Teagan is set to accomplish his mission. He could never have prepared for the king of Khidiff, Colum, though, or the warmth of his smile and his kingdom. Life seems joyous - but fate has plans of tragedy and the past will not stay away.