Warning: This article contains spoilers for Elementary Season 7 Episode 7, titled "From Russia with Drugs," that may spoil your enjoyment in discovering its plotlines. Read at your own risk.

Sherlock (Jonny Lee Miller) and Watson (Lucy Liu) are once again up for another mysterious case in Elementary Season 7 Episode 7. A robber who robs a fellow robber gets murdered, and the two will start to investigate the mystery behind the crime.

"Holmes and Watson investigate the murder of a criminal who made his living by stealing from other criminals," Elementary Season 7 Episode 7 official synopsis read. "Also, when Captain Gregson [Aidan Quinn] resumes leadership of the precinct, he suspects his interim replacement, Captain Dwyer [Rob Bartlett], is responsible for one of his best detective's suspicious departure."

The new case of the week seems to be a Robin Hood-like scenario, but it may be a different situation. Although this robber robs another criminal, it looks like it doesn't steal to share it to the good guys or poor people, per CarterMatt. The robber does it for itself.

Captain Gregson, on the other hand, returns to Elementary Season 7 Episode 7 alive and kicking. Although the supervisor is doing fine on his comeback, he has to tie some loose ends that may involve Captain Dwyer.

After almost facing his death, Captain Gregson survives, and he is going to be working full-time again. Quinn's character believes he can die at any moment, so he is going to do everything that he wants.

Captain Gregson may take Captain Dwyer down as Elementary Season 7 continues due to his alleged part of his best detective's departure. There is a theory that Odin Reichenbach (James Frain) may also have something do with it, as he is the guy who gets involved in everything.

Meanwhile, fans are about to see the appearance of Emily Swallow in Elementary Season 7 Episode 7. In the CBS Television Network press release, it revealed the Supernatural star, who is better known as Amara or The Darkness, would be the new episode's guest star, Bree Novacek.

However, CBS has yet to reveal more details about her character or even her storyline, but she is expected to be a good part of the show. So, fans have to wait and see what Swallow is going to do in Elementary Season 7 Episode 7, "From Russia with Love," when it airs on Thursday, July 4, at 10-11 p.m. ET/PT on the CBS.