'Riverdale' season 1 episode 4 spoilers, plot news: Miss Grundy's false identity uncovered; is she Jason Blossom's killer?

This week's episode of "Riverdale" is expected to feature more drama with the revelation that Miss Grundy (guest star Sarah Habel) has been living under a false identity.

A synopsis published on Spoiler TV about "Riverdale" season 1 episode 4, titled "The Last Picture Show, reads as follows: "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 (K.J. Apa) on the line after stumbling upon some startling information she's uncovered about Miss Grundy's 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."

A promo teaser for the upcoming episode of "Riverdale" has also been released. The trailer opens with a scene featuring Miss Grundy as she plays the cello in front of a crowd, with Archie and his father looking at her in admiration. However, underneath her beautiful exterior and innocent façade is an underlying dark secret.

"Everything about her is a huge question mark," Betty is heard saying in the trailer, referring to Miss Grundy.

It is later revealed in the promo teaser that the real Geraldine Grundy already passed away several years ago. A copy of her driver's license was also shown in the promo video, which revealed that her real name is actually Jennifer Gibson and that she is from Minneapolis, Minnesota.

Betty and Veronica's investigation eventually leads to them to snoop inside Miss Grundy's car. They find a gun, which potentially ties Ms. Grundy to the death of Jason Blossom.

The girls share their discovery with Archie. And in the final scene of the promo teaser, Archie is seen confronting Miss Grundy about her real identity, asking her about what her true intentions are in Riverdale.

"Riverdale" season 1 episode 4 is scheduled to air on Thursday, Feb. 16, at 9 p.m. EST on The CW.

"Riverdale" season 1 episode 4 is scheduled to air on Thursday, Feb. 16, at 9 p.m. EST on The CW.