Sullivan's Crossing has fans worried about where certain story lines will go in season 4 - but is every cast member even returning to the show? The CW series, which is based on a book series by Robyn Carr, follows neurosurgeon Maggie (Morgan Kohan) who must return to her hometown in rural Nova Scotia. Viewers are introduced to her estranged father, Sully (Scott Patterson), newcomer Cal (Chad Michael Murray) and more members of the community. After Sullivan's Crossing premiered on Netflix in July 2025, it found an even bigger audience.