Two new seasons of ‘Serial' in development

The makers of the hit true-crime podcast have confirmed that a third season of the show is also coming next spring.

The first season of "Serial" investigated an unsolved murder in Baltimore committed in 1999 and in doing so became an internet sensation by the time it came to an end in October.

Thanks to that success and a host of donations from a growing group of fans, the podcast's creators, Sarah Koeing and Julie Snyder have revealed that not one, but two new seasons of the show are in the works.

However, what the new shows, the first of which will air this autumn, will be about is a closely guarded secret.

Speaking to The AV Club, all that Serial's creators would say of the follow-up seasons was that: "They're very different from season one, but no less interesting to us."