It appears some changelings appear to have not been fully pushed out of Equestria, and a team of royal guards are sent to investigate, and if necessary, eradicate the problem.

Shining armor is not sure he can cope with this. Still not yet recovered from the attack during his wedding, and his mind control, he finds himself having to face what could be his words fear: ponies that had to go through what he did.

But he won't back down from this mission, and he may yet learn something about himself, and maybe even get better.