I'm not sure what card game they're playing, but I do know that, somehow, neither of them is winning.

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Transcript:

Panel 1: A well dressed merchant explains his plan to three thugs-for-hire, "… yes, it’s really that simple. You three, can go in and take everything you please. I don’t even need a cut of what you sell. I’ll be compensated quite well with the insurance money. Then in the morning, I’ll call the city guard like a good citizen, but they won’t find a trace of you at all!" 

The lead thug asks, "Speaking of guards, who’ll be watching the warehouse?"

Panel 2: Abby and Erry are playing a card game while sitting by the door to a warehouse as off panel the businessman assures, "Oh, don’t worry about them. They’ll be no problem for you."