Carly believes she is doing the right thing by ruining Drew's plan to find Willow's biological parents, but on the Tuesday, Dec. 20 episode of "General Hospital," Carly's plan may inadvertently push Drew closer to the truth.

In the ABC promo video, Drew (Cameron Mathison) tells Denise (Alice Rietveld) she won't be leaving until she tells him why she lied about Willow's (Katelyn MacMullen) birth mother. "GH" spoilers reveal that Drew forms a new theory.

In the previous episode, Drew met with Alexis (Nancy Lee Grahn) to tell her about his meeting with Denise.

Viewers are aware Denise was paid by Carly (Laura Wright) to tell Drew a fake story about a mysterious woman named Joan, who was Willow's birth mother and died at the commune.

However, after Drew spoke with Alexis, the two concluded that Denise's story was a lie.

Since Carly knows Nina (Cynthia Watros) is Willow's biological mother, she has been trying to bury the truth.

It appears Drew will try to get the truth out of Denise and form a new theory in the process. Will Drew's new hunch about Willow's birth parents allow him to gain the upper hand over Carly's plan?

Elsewhere in the promo video for the ABC soap opera, Nikolas (Marcus Coloma) tells Spencer (Nicholas Chavez) there is something else that he needs to know. "General Hospital" spoilers say Spencer clashes with Nikolas.

In the previous episode, Elizabeth (Rebecca Herbst) and Nikolas decided to move forward with their fake pregnancy plan.

Liz agreed to say she was pregnant with Nikolas' child so they could keep Esme (Avery Kristen Pohl), who is pregnant, captive until she gives birth.

It appears Nikolas plans to tell Spencer about his new sibling, which could further strain their fragile relationship.

Other "GH" spoilers tease Carly dodges a bullet, Sam (Kelly Monaco) worries about Dante (Dominic Zamprogna), and Nina confides in Phyllis (Joyce Guy).

​​"General Hospital" airs on weekdays at 3 p.m. ET on ABC.

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Drew (Cameron Mathison) is getting closer to learning Carly’s (Laura Wright) secret. The actors are pictured in a scene from a previous episode. ABC/Troy Harvey