By Natalie Abrams
September 14, 2016 at 12:00 PM EDT
Michael Parmelee/CBS
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When Elementary returns, Sherlock and Watson will be celebrating their anniversary of working together — but will it be their last?

With Joan (Lucy Liu) now having worked longer as a detective than as a sober companion, Sherlock (Jonny Lee Miller) begins to fear her professional wanderlust. “When the season starts, Sherlock comments that Watson has seemed down in the dumps over the course of the summer,” EP Rob Doherty tells EW. “He’s concerned that maybe the sadness that he has detected has something to do with the approach of this anniversary.”

“Joan makes it clear that she’s quite happy being a detective, but at the same time she misses helping people,” he continues. “It’s something that she could do when she was a surgeon, it’s something she could do when she was a sober companion, but, as she says in the first episode, she and Sherlock are in the punishment business.”

Enter reformed criminal and Sir Arthur Conan Doyle character Shinwell Johnson (True Blood‘s Nelsan Ellis), whom Sherlock encourages Joan to assist. Shinwell, who is transitioning out of jail, is a former patient of Joan’s from when she was a surgeon, and serves as a reminder of the good she can do. But there will be complications, of course. “He is someone with a dark and troubled past, who is trying to reform himself, but he brings a lot of baggage to our doorstep,” Doherty says, noting that as the duo come to learn more about Johnson, “there may be a difference of opinion on whether keeping him in their orbit is such a good idea.”

To read more from our Fall TV Preview, pick up the new issue of Entertainment Weekly on stands Friday, or buy it here – and subscribe for more exclusive interviews and photos, only in EW.

Elementary returns Sunday, Oct. 2 at 10 p.m. ET on CBS.

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