(CNN) The following contains spoilers about the "Billions" season finale.

Like a high-stakes card game, "Billions" has become especially adept at shuffling the deck, shifting its what's-in-it-for-me alliances in unexpected ways, while playing a long game in terms of double-crosses and jockeying among corporate titans.

In the bold third-season finish , that involved transforming two mortal enemies, hedge-fund manager Bobby "Axe" Axelrod and former U.S. attorney Chuck Rhoades (Paul Giamatti), into unlikely allies, each seeking to take down former subordinates who had dared go against them.

So perhaps inevitably, the fourth-season finale again shook up the playing field, with Axe and Chuck outwitting their opponents, but now poised to turn their guns back on each other, with Chuck's wife Wendy (Maggie Siff) again likely to be caught in the middle.

Chuck and Wendy's fraying marriage, a plot that played out across the season, has also created an uncomfortable possibility -- namely, that Wendy appeared to be experiencing an attraction to Axe, with whom she has always been extremely close strictly professional terms.

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