Millie Bobby Brown & David Harbour's New Netflix Series Is Recreating Stranger Things

A new mission brings them together

Netflix announced in June 2026 that Brown and Harbour had joined A Spy in the Blood. The series, which is currently untitled, is loosely inspired by Paul Warner’s debut novel and created by Jack Thorne, the Emmy-winning writer of Adolescence.

Harbour plays Matt Wolfe, a disgraced FBI agent who became a security expert. He is pulled back into the spy world after his estranged daughter Rebecca, an FBI agent played by Brown, disappears while on a mission.

Echoes of Hopper and Eleven

The setup recalls Hopper and Eleven in Stranger Things: a father figure is drawn into danger and makes protecting a young woman his priority. Rebecca, however, is an adult agent who wants to follow in her father’s footsteps, giving their relationship a different dynamic.

In Stranger Things, Hopper and Eleven began as unlikely companions before becoming found family. Their actors were both nominated for back-to-back Primetime Emmys for their performances.

A different kind of spy story

The new series shifts Brown and Harbour from supernatural drama to espionage. The story also gives them a more mature parent-child relationship than the one viewers saw between Hopper and Eleven.

Matt has been compared with Jackson Lamb, the washed-up former spy played by Gary Oldman in Slow Horses. But the article distinguishes Matt’s personal reasons for returning to danger from Jackson’s professional motivations.

Family stakes at the center

A Spy in the Blood also shares a father’s urgent efforts to protect a child with Adolescence, another series written by Thorne. The circumstances differ: Rebecca vanishes while working, while Adolescence follows Jamie after he is arrested on suspicion of murdering a female classmate. The article presents the combination of espionage and family stakes, alongside Brown and Harbour’s prior screen partnership, as a promising basis for the Netflix series.