Credit: PBS

The CW is jumping into the trend of airing event miniseries by acquiring the period piece Labyrinth, which will star Jessica Brown-Findlay of Downton Abbey fame.

The four-hour series will also feature John Hurt (Tinker, Tailor, Soldier, Spy) Sebastian Stan (Captain America: The First Avenger) and Tom Felton (the Harry Potter films). The miniseries will jump back and forth between modern and medieval France by following the lives of two women who are separated by centuries, but united in their search for the Holy Grail.

Brown-Findlay, who played Lady Sybil Crawley in Abbey, will portray Alaïs, a character who is given a book by her father that contains the secret of the Grail.

All the broadcast networks have event series — their new way to describe miniseries — in development for the next several years.