After three successful seasons on NBC, and with the third season's cliffhanger finale being well-received, showrunner Jeff Rake should have been having positive talks with the network about the next season, but he wasn't. Instead, he had a pretty bad feeling about the fate of his show with NBC. According to Jeff, despite them liking the show, the network couldn't keep it on for financial reasons.
So then, the next move for Jeff and the team would be to try and find a new home for the show, but before they could even write up a plan, the fans jumped in, as Jeff recalls:
"So before we even had a chance to lift a finger to figure out if we need a PR campaign to help save us, the fans rose up and created this campaign and spread the word — which was incredibly rewarding and heartening.”
So, the show moved over to Netflix, but there wasn't a fourth season confirmed. The fans sent letters, were active on social media, and even bought a billboard outside Netflix's offices. While these were all shows of faith in the show, what really made Netflix commit to another season was the wave of new fans that had started to watch from the beginning when it arrived on the streaming site.