London, 1826: When prominent society couple Mr. and Mrs Benham are found stabbed to death, all eyes turn to their maid, Frannie.

Frannie and Madame’s relationship develops. Meanwhile, horrific experiments conducted at the Paradise plantation come to light.

Frannie and Madame’s relationship comes under threat as jealousies flare in the Benham house, and Madame’s own issues worsen.

Frannie must face the music. Will the shocking truth surrounding the Benhams’ murders and Langton’s experiments finally be revealed?