“Pretty Little Liars: Summer School” trailer introduces a new murderer

"A" has a mother?!

You know what they say: Behind every serial killer is an even deadlier... mother?!

The first trailer for Pretty Little Liars: Summer School is out now, and it shows Bailee Madison (Imogen), Minnie (Malia Pyles), Noa (Maia Reficco), Tabby (Chandler Kinney), and Faran (Zaria) doing their best to enjoy life now that "A" has been captured and is on death row. However, their enjoyment is quickly cut short when they discover they must attend summer school. And for a moment, they think that is what's going to ruin their summer.

<p>Max</p> 'Pretty Little Liars: Summer School'

Max

'Pretty Little Liars: Summer School'

But when they start hearing that "A" had a mother named Bloody Rose Waters, well, let's just say you don't want to get a letter from Rose. And if you do, you could find yourself playing the worst game of hide-and-seek imaginable.

Find out which of the Liars make it out alive when Pretty Little Liars: Summer School premieres May 9 on Max.

Watch the full trailer for season 2 above.

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