I have to confess, first and foremost, that Mind Control isn't a genre that normally attracts me. I'm extremely happy that in this case, I put aside my usual reluctance.
The Accidental Master could well have been called The Reluctant Master, and that is what sets it apart from the rest of the genre. Rather than a monster revelling in his power over others, our chief protagonist is troubled by his gift, disturbed by his power, and the way it makes his 'slaves' dependant on him. The twist in the tail is just icing on the cake of an excellent story.
Technically, there is little to be concerned about. OK there are things I would have changed had I been editing the text, but there's nothing to spoil the enjoyment of the tale.
The Accidental Master is well worth reading, even if Mind Control isn't one of your favourite subjects. I shall certainly be adding it to my library, I suggest you do the same.