Keep reading for the spoilers!
On Rachel's new relationship with Mike:
"Season 3 finds her breaking this pattern of love and hate now that they're together. It's so multilayered. ... It won't be quite as volatile as it's been the past two seasons. Now they're on a learning curve of figuring out what a real relationship looks like when you are doing it at the office and they're trying to keep it a secret."
Mike and Rachel 'shippers will be happy to know that it does get serious. In a Guess Who's Coming to Dinner-esque episode, he meets her parents, including her heretofore unseen mom played by Megan Gallagher. But there will still be residual damage from Mike's secret. While his big white lie would be tough for any significant other to handle, it carries an extra sting for Rachel as she continues to pursue law school this season.
On Rachel's ambitions:
"Mike has everything she wants and he didn't have to work for any of it," Markle says. "One could say that he didn't have to work for her. It's her figuring out how to want him and love him even though he has all she wants, but there is some resentment Rachel feels because of this ambition. I love how ambitious she is. ...
She's going to assert herself at work more this year. And even though she has this Achilles' heel of not testing well, I want Rachel to be a lawyer. As an actress, I hope [she goes to school] in New York otherwise there won't be much Rachel Zane! She'll be applying and seeing what that could do to her career and her relationship. What if she goes to Stanford or out of state? Mike, to his end, is very supportive."
On Donna's betrayal:
While Rachel's relationship with Mike is growing, another one deteriorates. Rachel learns that Donna (Sarah Rafferty) not only knew Mike's secret, but had encouraged Mike not to date Rachel. "When you discover that from a friend, it feels like a tremendous betrayal," Markle says. "The two people she feels this closeness to at work have kept her in the dark on this. When it's one of your girlfriends, who you feel like you can trust, it hurts even more. There's a rift and it really does change the game for their friendship."
Markle remains mum on when that rift will be repaired — "The writers know we have a lot more fun when we banter and play," she teases — but rest assured that, despite the bumps, Mike and Rachel are still "trying to make it work" by the midseason finale. "We are at [Episode] 10 right now, so I don't know what the next six episodes have in store for them, but they are trying to figure it out," she says. Which means, get ready for an even "messier" House Zane, not to mention a less put-together Rachel herself.
Suits airs every Tuesday at 10pm on USA.