The Halcyon celebrates its 50th anniversary; Lucian struggles to keep things in order as the pressure mounts; Garland and Lady Hamilton find a cause together.
Adil has to deal with a terrible secret; the hotel comes under increased pressure from the police; Emma and Joe edge closer together; Freddie returns.
The Halcyon struggles on as the Blitz rages, with the guests forced into lockdown in the basement.
Despite Emma's hard work overseeing a wedding reception, an air raid forces the wedding guests into the basement.
Betsey receives an unexpected family visitor while Joe becomes torn between excitement and uncertainty with a great opportunity.
Lady Hamilton becomes drawn to a guest arriving at the hotel after Germany advances into France; Max makes a difficult decision for the sake of his family.
The hotel suffers the aftershocks of change; Lady Hamilton and Garland go to war -- but this may be the least of his troubles.
Lord Hamilton returns to the hotel just as a scandal threatens to engulf it; a mysterious American guest arrives, and Garland must reckon with unwanted visitors; Freddie returns to the hotel with a surprise for Emma.