I'm cutting your question off there because this is one of those shows people are passionate about, and sometimes like to binge-watch a season at a time. Rather than risk ruining any plot points for anyone, I'll answer your question as broadly as I can.

You have no need to worry, you haven't missed anything, the producers just expect you to keep up.

Both the second and third seasons involved huge leaps forward in time, leaving it to the circumstances and characters' dialogue to let viewers know what's happened in the interim.

At the end of season 2, the First World War is still tearing Europe apart, but the third season starts in 1919, months after it finished.

The same sort of time lapse happens between season 1, which is set in 1909, and season 2, which starts up in 1914.

Those are significant time jumps to keep up with, but viewers also have the real life story of Harry Selfridge, founder of the still-thriving Selfridge's department store, to go by.

Before the third season premiered, executive producer Kate Lewis hinted at what was to come.

"You only have to walk down Oxford Street today to know that Selfridge's department store continued to be successful," she said. "But for its founder, Harry Selfridge, things were very different. His story was a roller-coaster ride that ended rather tragically. We pick up series 3 in 1919 -- the point at which his life really begins to unravel.''

As dire as that sounds, viewers shouldn't get too worried -- the show has already been renewed for a fourth season, so his life can't unravel too much this season.

The renewal came two weeks before the third season even premiered in North America, but that's because we're a few months behind Britain, whose ITV network produces the show. In fact, the third-season finale aired on ITV on March 29, the same day the season premiered on PBS.

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