Sam and Juliet's love grows, but a hidden secret threatens their relationship. Tony hosts a party for other concierges while Gino tries to find the identity of the writer of an erotic novel among the staff. Also, Mel's lie starts to crumble.

James and Gino are are asked to organise the extravagant funeral of a VIP guest . If the event is a success Juliet tells James that he will gain a promotion at the hotel. An old boyfriend of Juliet's checks into the hotel and wants to give their relationship another go. Sam becomes jealous and ends up having a one night stand with one of the hotel's guests.

The hotel has managed to secure an exclusive magazine deal to host a Royal wedding with an Italian magazine called Certo!. Juliet is surprised when Sam plans to press ahead after the wedding is canceled using the hotel's staff as the wedding party. When Juliet finds out that Sam needs the money from the deal to pay a tax bill she decides to help him. Gennaro Fazio, the magazines editor exposes what they are to though.

The staff are sent on a team-building course by Sam to improve their performance. Sam's plan doesn't go as he hoped when Juliet is forced to resign. A guest at the hotel makes eyes at Gino. Valuables go missing from the hotel after Juliet and Ben attempt to help a homeless man.

When Emily's estranged father turns up at Babylon, she wants him to leave, but he has something he needs to tell her first. Meanwhile, Sam gambles Hotel Babylon and loses, and Tony meets his doppelganger and they put their uncanny resemblance to good use.

The staff take part in a treasure hunt around the hotel searching for valuable emeralds claimed to be hidden there. Gino finds himself being conned by a man staying at the hotel. Tony discovers that a former film star staying at the hotel isn't quite as she seems.

A couple who are both celebrities hold their joint 40th birthday party at the hotel. Anna finds out that they are not as happy as they seem together. Sam ignores Juliet's advise and better judgment when he lets lets two rival boxers stay at the hotel.

Hotel Babylon is closing. Tony desperately pitches the hotel to an Asian businessman, but the deal goes into freefall when Tony refuses to meet his demands. Meanwhile, a terror alert throws Central London into chaos, and a crowd seek refuge in the hotel. The team pull together fantastically, and a millionaire caught up in the bedlam is so impressed that he decides to buy Babylon, securing its future. Elsewhere, Anna is nearly eight months pregnant, but is in total denial.