BEFORE YOU READ...
Yes, I am well aware that in PLL it's "A". So don't start thinking "oh, this is an total rip-off." It's. Not. A. Rip. Off.
A is
1-the second letter I needed.
And 2- the first letter of the word.

It's been a great three months.

Sunset went back to law school, and is also doing work at CHS.
Rarity finally showed herself, and is leading her life again.

Fluttershy and Sour Sweet started dating.

Lemon Zest moved to Manhattan.

Indigo and Sugarcoat broke up.

Mera started helping in the councilor's office.

River kissed Miss Cherilee.

Sunny and Rarity are still in love.

The Dazzlings found themselves new friends.

But a new threat is haunting them all.

There is now A, who seems to be picking up where H had ended.

And the girls still have many questions:

Why did Henna and Applejack betray us?

How are they still alive?

Why did she have to die?

Why us?

What makes us someone's target?

While they want the answers, each one comes with a price. One that they can't afford.