Across Canterlot, Nocturne ponies seem to be trying to murder their own foals.

Foal Services gets involved.

With the assistance of Chaplain Grave Beetle of the Night Guard, Nursery Garden aims to crack the case.
And maybe learn something about herself along the way.

(No death, child or otherwise, occurs)

"We never met the other Pillars, and we were too young to understand the danger they faced."

Luna's off-hoof comment sets Twilight on a path of thought, and she demands an explanation for her conclusion.