Spencer is curious about why Garrett is her mom's client, so she investigates and uncovers a family secret. Elsewhere, Emily receives unexpected news about her English test; and Aria has an ulterior motive for assisting Jenna.

Aria and Emily search for "A" at Jenna's lavish birthday party. Meanwhile, Spencer keeps an eye on Garrett, who's out of jail visiting his sick mother; and a brokenhearted Hanna uncovers a surprise.