According to a tweet from popular young adult horror writer R.L. Stine, his mystery Marvel project will be revealed in a few days. Appropriately teased on Halloween, Stine will soon turn his attention from the books in his "Goosebumps" and "Fear Street" series to comic books -- and we'll learn more about the project "in a few days."

Yes, I'm writing a series of comics for Marvel. And yes, I'll be able to tell you more about them in a few days.— R.L. Stine (@RL_Stine) December 8, 2016

The tweet also makes it sound like Stine could be writing more than one series of comics. He says he'll be able to tell us "more about them" instead of "it." Of course Stine could be referring to multiple issues of one series as opposed to multiple series.

Stine originally teased his upcoming Marvel project via a Reddit AMA session. During the Q&A session, Stine said, “I’m writing a series of comic books for Marvel -- my first comics ever. But I’m not allowed to talk about them yet.” Marvel has not yet made an official announcement regarding a project with Stine, and Marvel did not comment when reached by CBR.

The 73-year-old writer is most known for his line of “Goosebumps” novels, which originally ran from 1992 to 1997, lasting 62 installments. The line has since been revived and continues today. Stine’s work has inspired a number of live-action projects as well, including a television series as well as a 2015 feature film starring Jack Black. In the film, Black played a fictionalized version of Stine; the author himself played a teacher named “Mr. Black.” Stine is also known for the teen-oriented “Fear Street” young adult series, which launched in 1989, and the more recent “Mostly Ghostly” novel series.