John O'Brien

Everybody seems to know who the father of Rachel's baby is except the man himself. Meanwhile, Phoebe and Joey lie about a gas leak to get into Monica and Chandler's apartment.

A persuades Hanna to return to her law-breaking ways, Noel keeps baiting Ezra, Emily's mum disapproves of her and Maya's relationship and Spencer adjusts to Melissa's marriage.

The Liars are desperate to uncover what new scheme "A" has in store for them in the wake of the lodge fire.

Caleb and Toby investigate "A" and uncover new information on "Red Coat"; Hanna's friends are unsure how to help her; Mike's behaviour worries Aria; the Liars seek a new suspect in Wilden's murder.

Aria, Emily and Hanna suspect the worst when Spencer goes missing; Emily meets Olympic champion swimmer Missy Franklin.

Aria unravels after she learns about Ezra's betrayal, Spencer tries to prove to Toby and her parents that she can overcome her addiction and Paige becomes fed up with Emily's secrets.