Harry Selfridge arrived in London from Chicago in 1908 with a grand plan to open the finest department store in the world.
Selfridges is open but is short of customers so Harry devises a plan to boost publicity for the store. He throws himself into the task but neglects his wife, Rose.
Both Lois and Henri spot the threat of an ascendant Ellen Love. Agnes helps Henri develop the new house perfume - does Victor have a rival for his affections?
Harry wins a major publicity coup when ballerina Anna Pavlova agrees to visit the store. But Agnes' job comes under threat as Reg reaches breaking point, and he crashes the event.
Harry is delighted with the motor car he has had brought in for a spectacular new window display. Roddy surprises Rose at home, where he is spotted by young Beatrice.
Harry is unconscious after his accident. Victor and Lady Mae have an affair, and Agnes and Henri's friendship grows.
Sir Arthur Conan Doyle arrives for a book signing and persuades Harry to hold a seance in the store.
Things get awkward for Rose when she bumps into Roddy at Lady Mae's soiree. Agnes and Henri's relationship hots up.
Harry invites explorer Sir Ernest Shackleton to the store to give a lecture but is rattled by news of a death.
Harry's excitement about a royal visitor is tempered by an invitation to the first night of Ellen Love's play. Henri has sad news for Agnes. Kitty lets Miss Mardle in on a secret.
Business is booming for Harry, and new faces join old favourites at Selfridge's.
Rumblings of war and social unrest inspire trades union activists to target Selfridge's. Harry responds by throwing a tango party to thank the staff.
Agnes manages to pull off a spectacular Empire Celebration. Henri returns and Harry offers him a job back at Selfridges. Britain declares war on Germany.
As the first news of the horrors of war arrives from Belgium, the men of Selfridges clamour to sign up.
With so many of the male staff having joined up and away at the war, women are now working in the loading bay - where they struggle to cope.
Anti-German feeling is running high so Harry arranges a patriotic concert, Agnes and Victor revisit old territory and a paranoid Thackeray takes action against Henri.
Following Henri's arrest and Harry's disappearance, everyone is in a state of confusion. There is more bad news from the front - especially for Agnes.
Harry arrives home to deal with a scandal in the press, general disquiet and Henri's arrest. Thanks to Delphine, Selfridges gets a morale boost from America.
After recent ructions, Harry is more determined than ever to get Selfridges back on track and asks Delphine to organise a special event in the store.
Harry is desperate to clear his name, Victor and Agnes endure some painful soul-searching when a loved one returns, and Miss Mardle grapples with a romantic dilemma.
It is now 1919 and the war is over. After losing his beloved wife, Harry and his family look forward to a happy family event - his daughter Rosalie is to be married.
While Harry decides to pursue a new charitable project, Crabb is faced with a massive professional dilemma. Agnes faces an unexpected challenge very close to home.
Harry goes ahead with his plans for the estate, buying a field at auction - only to find there is an unexpected rival bidder. Henri continues to behave erratically.
Frank is horrified to realise that he might have been complicit in his own wife's attack. Violette has her eye on Victor. Henri and Agnes are struggling.
Harry and Nancy's secret romance continues. There is a race for the post of deputy manager. Princess Marie is forced to reveal the truth about her situation.
Following Violette's arrest, Harry is struggling to keep her in check. Gordon takes up his post as deputy manager. Victor brokers a deal with a shady businessman.
Harry continues to romance Nancy, who begins to feel the weight of her deception. Mr Grove struggles to face recent events. Miss Mardle is wracked with guilt.
To celebrate the signing of the landmark Treaty of Versailles, Harry consults his newly appointed Head of Press and Print on a way to mark this moment in store, who is none other than old friend Frank Edwards.
Harry holds the biggest flash sale in the store's history, taking a massive gamble in the process. Nancy finds it difficult keeping her engagement from Gus.
Harry and Lord Loxley clash in a dramatic confrontation. Princess Marie probes into the status of the Selfridge Estate. Gordon faces a big romantic decision.
It is now 1928 and Harry Selfridge is at the pinnacle of his power and public celebrity - a retail giant. At home, Rosalie has a daughter, Tatiana, the apple of Harry's eye.
After the accident at the Queen of Time unveiling, Harry is recovering at his country home, but returns to the store to open a new, cutting-edge technology department.
It is now the 1920s and Harry makes the acquaintance of Jimmy Dillon, a mysterious entrepreneur, and is happily distracted with new belle Rosie Dolly.
Harry throws a typically decadent party that gets out of hand. Back in London, the store staff prepare for a special visitor, and Grove gets a blast from the past.
The ground floor of Selfridges is transformed into a movie set, as Double Trouble - starring the Dolly Sisters and acclaimed actor Bumby Wallace - is being filmed.
Harry is left reeling in the aftermath of the assault on the store, and is finally forced to admit to D'Ancona the true state of his financial affairs.
Harry is determined to get the store - and his life - back on track with a classic, store-wide summer promotion, but Lord Wynnstay is out to make more trouble.
Harry, Gordon and Jimmy announce the purchase of Whiteleys. Grove is forced to admit that it is time to retire, while Crabb helps out and makes a worrying discovery.
Special preparations are in progress to celebrate the 20th anniversary of Selfridges, while Harry works hard to break the suppliers' embargo of Whiteleys.
Jimmy's final act leaves Harry reeling and he retreats from the glare of the tabloid frenzy, isolating himself. Mae contemplates her future and Mardle returns.
