The April 9 episode of “Dig” promises to be a game-changer for the labyrinthine USA series — just as Golan (Ori Pfeffer) arrests Emma’s suspected killer, Peter (Jason Isaacs) makes a startling discovery that changes everything.

Variety has an exclusive sneak peek from the episode, titled “The Well of Souls,” which sees Peter’s boss, Lynn (Anne Heche), issue her wayward agent a stern warning — although Peter can’t be sure whether the tension is professional or personal.

Meanwhile, in Croatia, Avram (guest star Guy Selnik) and the red heifer are kidnapped by a stranger with a mysterious agenda. In New Mexico, Tad Billingham (David Costabile) desperately tries to keep Debbie (Lauren Ambrose) and Josh (guest star Zen McGrath) from exposing his secrets.

Isaacs recently told Variety that the casualties will continue to stack up on the series as the stakes grow higher: “One of the joys for the audience of being told stories by these master storytellers is that you don’t know what’s going to happen and who’s going to die,” he teased. “So I can say this, the body count is quite high by the end, and there are increasingly grisly and numerous deaths in it.”

“Dig” airs Thursdays at 10 p.m. on USA Network.

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