The series marks the first major TV role for both Bloom and Delevingne, who got her start as a model before shifting to film.
She will co-star alongside Orlando Bloom, whose casting was announced along with the show last week.
As previously reported, Bloom leads as the man at the center of it all: Rycroft Philostrate, a police inspector piecing together the murder of a faerie showgirl on Carnival Row.
The project is based on Beacham’s feature script, A Killing on Carnival Row, which appeared on the very first installment of the Hollywood Blacklist in 2005.