'Suits' season 5 spoilers: Louis' sister causes troubles in the law firm in episode 4

Amy Acker joins Suits Season 5 cast as Louis' sister Esther. USA Network

Will Louis Liit (Rock Hoffman) find another reason to hate Harvey Specter (Gabriel Macht) in the next episode of "Suits"?

Based on the trailer for season 5 episode 4 titled "No Puedo Hacerlo," Louis' gorgeous sister Esther visits the law firm, but he does not seem to be pleased. Louis asks her why she is in town, and how long she will be staying. He obviously wants Esther to be out of the firm as soon as possible, but it looks like his sister has other plans. 

Then the teaser shows Esther being friendly with Harvey, who appears to be enjoying her attention. Louis notices it, and he is seen storming toward Harvey's office to warn him to stay away from his sister. Harvey assures him that messing up with Esther is the last thing that he will do, but will he keep his promise, especially since Esther is the one who is initiating their interaction in the first place? 

In a surprising casting addition, Esther is being portrayed by "Person of Interest" star Amy Acker. The actress was not mentioned in any casting rumors that were written before "Suits" season 5 began. Her present stint in CBS's sci-fi drama made her an unlikely cast addition, but it seems like USA Network's legal drama series found a way to work around her busy schedule to include her in a recurring role. 

Esther's sudden appearance in the show could also shake the already tumultuous relationship between Harvey and Louis, as well as Harvey and his former legal secretary Donna Paulsen (Sarah Rafferty), who also happens to be his long-time love interest. It could also cause a rift between Donna and Louis, who happens to be her new boss. 

Meanwhile, Mike Ross' (Patrick J. Adams) attempts at impressing his future father-in-law Robert Zane (Wendell Pierce) continues as they work on a case together. But as the case drags on, Mike realizes that he and Rachel's (Meghan Markle) father have a lot of differences. 

The official synopsis for the episode reads: 

Harvey steps outside his usual area of expertise, in order to take a case from a client who has a special tie to the firm. Mike and Zane work their class-action case together, but Mike learns they have different ideas about what constitutes a win – for themselves, and for their clients. And Donna counsels Louis on the best way to settle a feud." 

"Suits" season 5 episode 4 airs Wednesday, July 15. 

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