lyra heartstrings love three main things Bon-Bon her lyre and humans (not nessaseraly in that order)so what happens when one breaks and then is fixed by a mysterious pony joy.but when twilight gets wind of this and hears of several cases just like it she decideds to investigate and of course with pinkie pies help they find that a pony feared is not nesscelaly evil (usually but not allways)