The Insider.com

Annie Walker slipped out of her comfort zone, and her clothes, in order to woo the mysterious Simon Fischer. But real feelings began to bleed in and Annie nearly blew her cover in a bid to keep Simon from making a deadly deal the fourth episode of Covert Affairs' best season to date.

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Tonight, Simon is back and TheInsider.com has an exclusive sneak peek clip that shows Annie is still very much struggling to keep her work life and professional life separate.

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Titled Loving the Alien, the episode begins with Simon (the devilishly handsome Richard Coyle) inviting Annie on a trip to Cuba. Knowing this is her best shot at figuring out what Simon's been up to -- and what it has to do with that symbol emblazoned on his back and that box -- Annie accepts.

But taking this trip means Annie is on her own. No Joan. No. Auggie. No backup. No way out if she gets caught.

Check out our exclusive clip and tune in to Covert Affairs tonight at 10 p.m. on USA.