Serial junkies, get out your sleuthing kits again. National Public Radio’s wildly popular podcast is coming back with two new series.

In an e-mail sent to Serial newsletter subscribers on Wednesday, producers said they hope to launch Season Two this autumn and Season Three next spring. “We are hard at work reporting not one, but two distinct new stories,” they say.

Planning for a second season was easy after a successful launch in which Sarah Koenig and Julie Snyder investigated the true-crime case of Adnan Syed, a young man imprisoned for life for killing an ex-girlfriend.

Syed, who has maintained his innocence in the strangulation of Hae Min Lee in 1999, was granted a request for review by a Maryland court after Serial dissected the evidence against him last year.