I'll try not to give you too much away - there are lots of surprises, well worth waiting for.
First and foremost comes at the very end, when Thomas comes up with a unique way to keep his family and business together. Totally unforeseen, and astonishing.
We also have a shocking death, early in the season, which changes, well, not everything, but a lot. As much as I regretted this happening, it gives the story a jolt, to say the least.
Arthur and John are in fine form - including in one scene in which tattoos are searched for - and Michael and Polly have an important roles, too. Tom Hardy is memorable, again, as Alfie, and in fact all the acting is outstanding, with Cillian Murphy and Paul Anderson in the lead.
As always, Tommy has his hands full, fighting old and new enemies, and keeping his family in line and resistant to inner and outer demons. After three seasons, I would say that Peaky Blinders has equalled or exceeded Boardwalk Empire, and may be on its way to giving the Godfather saga a run for its money.
England in the 1920s is a great locale for this story, mixing cars and horses, Soviets and locally corrupt authorities of all stripes. The third season, like the first two, is just six episodes, leaving plenty more to tell in the story. So you here next year!
See also Peaky Blinders: Peak Television