You never know what might be hiding right under your nose. Often it's just simple things, like town gossip or a embarrassing secret. Seldom is the secret much more life changing, for example discovering that your entire life you were only half pony and that the other half is changeling. Mach Racer will have to cope with this revelation, all while keeping it a secret from everypony he meets.

Many thanks too my editor- Orangejuicehero