According to The CW's new episode synopsis for "Riverdale," the inhabitants are in for plenty of shock, mystery, and adventure in the fourth installment. Last night's debut proved Riverdale is not the squeaky clean town everyone assumed it to be -- and one thing is for certain: Archie's world is not just about love-triangles anymore.

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Take a look at the episode synopsis for "Riverdale's" fourth installment, below:

“Chapter Four: The Last Picture Show” — (9:00-10:00 p.m. ET) (TV-14, DLS) (HDTV)

HOLDING ON — When Jughead (Cole Sprouse) learns that an anonymous buyer has plans to tear down the local drive-in, he fights desperately to keep it open. Betty (Lili Reinhart) finds her friendship with Archie on the line after stumbling upon some startling information she’s uncovered about Miss Grundy’s (guest star Sarah Habel) past. Elsewhere, Veronica (Camila Mendes) confronts her mother Hermoine (Marisol Nichols) about a suspicious meeting she witnessed between her mother and a shady Southside Serpent. Finally, after uncovering Betty’s diary, Alice (Madchen Amick) finds the perfect opportunity to destroy Archie’s golden boy image. Madelaine Petsch and Luke Perry also star. Mark Piznarski directed the episode written by Michael Grassi (#104). Original airdate 2/16/2017.

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Starring K.J. Apa as Archie Andrews, “Riverdale” airs Thursdays at 9pm ET on The CW. The series also stars Cole Sprouse as Jughead Jones, Camila Mendes as Veronica Lodge, Lili Reinhart as Betty Cooper, Ross Butler as Reggie Mantle and more. “Breakfast Club” alum Molly Ringwald will also recur as Archie’s mother Mary.