After Sunny Day's parents were lost in a house fire that seemed to have been purposely caused. Sunny Day gives up gardening in Canterlot and decides to start an Investigations Agency in Ponyville called Sunny Investigations.
Even though everything around Ponyville seems nice and quiet, Sunny discovers some serious things are happening when he begins to scratch the surface of problems that start to happen. With the help of his new friends, Sunny is determined to take down any and all crime that springs it's head up.
EDIT: This story has now been cancelled.
Due to the fact that I can't really think of much else (anything good anyway) to do for. Also being that I've got other things to do.
I may continue it if I suddenly get an idea, but until then, you'll just have to wait.
sounds.... promising
Either the days are really short, or sunny days walks at the top speed of the Smart ED. (Erectile Disfunction) This story seems ok so far, but make the chapters a little longer and it will be better.
On a side note: Engines are cool. 
UNLESS THEY'RE HOT! 
You have an interesting premise, but you need to apply the basic rules of dialogue. To start off, every time you change speakers, you need to start a new paragraph.
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Ah, yeah. Sorry. I don't normally write often so I forget things like that.
Geez, that's gotta be a record. The guy can't have been on the case for more than a few minutes and he's already been sapped.
Something for you to consider is that when you're conveying a character's thoughts, you should change the text style. Italics is usually the preference.
hmmmm...everyone, everypony, everyone...
but good story so far
Oh yah, AHM IN SOMEPONIES FANFICTION, WOOOOODOWGY!
Nice.
Keep at it! Ah love et! he he...RD squeed for me *squee*
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FACEHOOF OVERLOAD.
Your writing style is a bit awkward. The story just doesn't flow as nicely as it should
sheesh...