Well received new drama series Killing Eve is becoming a breakout hit for BBC America.

The show’s third episode, which aired Sunday, hit a new series high, drawing 758,000 total viewers in Live+3. That’s up 10% from week 2 and up 95% vs Live+Same day. In the network’s target adults 25-54 demo, the week 3 episode drew 296,000 L+3 viewers, up 13% from the prior episode and up 116% vs L+SD. Killing Eve has now posted double-digit ratings increases among total viewers adults 25-54 (as well as adults 18-49) in both Week 2 and 3, becoming the only new drama on ad-supported TV this season to post consecutive growth over its first 3 weeks. Additionally, its L3 % lifts have consistently gone week-to-week in viewers and 25-54. (you can see a chart of the series’ ratings to date under the post.)

“It’s pretty amazing, it’s not the sort of behavior that is remotely typical in the TV business today,” said BBC America president Sarah Barnett. “It’s a show that critics and fans have taken to heart and have really enjoyed and really loved. I think this is all about an incredibly strong word of mouth, I think that’s why we are seeing this unprecedented three-week trend and long may it continue.”

This Sunday, Killing Eve airs its fourth episode, crossing the half-way mark of its eight-episode Season 1 run. Barnett urged fans who are still getting into the show to binge the first half as she teased an “explosive” fifth episode.

Killing Eve, which hails from Fleabag creator Phoebe Waller-Bridge, received an early second season renewal ahead of its series premiere. Starring Sandra Oh and Jodie Comer and based on the novellas by Luke Jennings, the series centers on two women; Eve (Oh) is a bored, whip-smart, pay-grade security services operative whose desk-bound job doesn’t fulfill her fantasies of being a spy. Villanelle (Comer) is an elegant, talented killer who clings to the luxuries her violent job affords her. These two fiercely intelligent women, equally obsessed with each other, go head to head in an epic game of cat and mouse.

Asked to provide clues about the Killing Eve‘s direction in Season 2, Barnett said, “Half of the show is a psychological drama between these two women. There is a lot of places that the team wants to take that particular relationship that I think would be gratifying but also continue to surprise in season 2.”

Waller-Bridge, Sally Woodward Gentle and Lee Morris serve as executive producers and Oh as associate producer. The series is produced by Sid Gentle Films Ltd and distributed by Endeavor Content.