Bridget encounters someone who played an important role in her and Siobhan's past. Malcolm discovers something of Bridget's in Henry's possession. Catherine asks Andrew to make a decision about Juliet that could have major ramifications.

Bridget retraces Siobhan's last steps prior to her disappearance and discovers that her twin kept a secret office. Olivia blackmails Henry into introducing her to Gemma's wealthy father. Tyler faces a moral decision that could impact Siobhan and Andrew.

Juliet's mother visits and causes trouble for Andrew and Bridget. Bridget discovers someone she believes is key to learning more about her sister. Henry finds a lead that causes Machado to think he's closing in on Bridget.

Bridget offers to host a fund-raiser for Juliet's school and learns that her friend Greer knows one of Siobhan's secrets. Siobhan can't believe that Bridget has adapted as well as she has to her new life. Malcolm goes to work for Andrew. Henry mourns his wife.

Henry homes in on a suspect in Gemma's disappearance. Malcolm goes to the police with his hunch about Charlie. Juliet becomes obsessed with Mr. Carpenter. Machado meets with an informant in Wyoming.

Bridget realizes she's growing fond of Andrew. Henry and Andrew's business partner bond. Malcolm has doubts about Bridget's new NA sponsor. Bridget decides to meet Siobhan's therapist in order to gain insight into her sister's life.

Andrew and Bridget receive upsetting news that also impacts Henry. Juliet and Mr. Carpenter continue to form an unlikely bond. Malcolm arrives in New York and is confronted by Machado. Siobhan's relationship with Tyler is threatened.

Siobhan-Bridget reveals that she has a twin to Andrew and Henry. Henry becomes a suspect in the disappearance of Gemma. Juliet parties to dangerous extremes. Malcolm escapes.

Bridget can't connect with Gemma, causing her to wonder if something occurred between Gemma and Henry. Juliet's teacher comes to her aid when she stands up to a bully at her new school. Bridget asks Charlie for a favor. Machado investigates Malcolm's disappearance.

Gemma reacts angrily to Bridget's revelation, and threatens to expose Bridget unless she exposes Henry's infidelity. Things get worse from there. Bridget goes to an Narcotics Anonymous meeting and does not give her name. "Siobhan" apologizes to Juliet for "stealing" her dad from her mom, and they begin to reconcile.

Bridget, who's still posing as Siobhan, heads to the Hamptons with Andrew, Gemma and Henry to celebrate Siobhan's birthday. While there, Henry is adamant about rekindling his affair with Siobhan. In other events, Gemma learns some unsettling news and Bridget is forced to reveal some of her past when Machado closes in on some new information.

Bridget discovers a possible clue that could lead to Siobhan's killer, and uncovers intriguing information about Andrew. Machado continues to pursue Bridget. Henry and Gemma butt heads over their investment in Andrew's hedge fund.

Bridget tries to cover up a crime she committed without blowing her Siobhan cover. Machado stays in NYC to learn more about Siobhan. Bridget confides her secrets to Malcolm. Andrew and his business partner throw a party. Gemma's suspicions of Henry grow.

On the run from the mob, Bridget assumes the identity of her deceased twin sister, Siobhan, only to realize that her sister's life was no less complicated than hers.