Millie Bobby Brown is set to solve more mysteries. “Stranger Things’” second season saw her character, Eleven, digging for answers about her own mysterious past, and now Brown has signed on to play a detective. The Emmy-nominated actress will star in and produce a feature film series based on Nancy Springer’s “Enola Holmes Mysteries,” Deadline reports.

The book series kicked off with 2006’s “The Case of the Missing Marquess,” and five other installments have been published since. The stories follow Enola, the much younger sister of Sherlock and Mycroft Holmes.

Springer has revealed that her editor asked her to come up “something set in deepest, darkest 18th century London at the time of Jack the Ripper.” She remembered loving Sherlock Holmes stories set in that time period when she was a child, so she created the character of Enola. “I gave Sherlock Holmes a younger sister that nobody else was aware of, and I made her capable of running rings around him, because he was a misogynist and he did not understand women or the ways that women communicated,” she explained.

Brown will produce via her PCMA Productions banner.

Best known for her role in “Stranger Things,” the child actor’s other credits include “Grey’s Anatomy,” “Modern Family,” and “Intruders.” She’ll star alongside Sally Hawkins (“The Shape of Water”) and Vera Farmiga (“Bates Motel”) in “Godzilla: King of Monsters,” set to bow in 2019.