Sarah is doing just fine...
Sure, she's been single for the last two years, and has to spend an uncomfortable amount of time around her ex-boyfriend, his perfect new girlfriend and all their mutual friends. And yes, her job as a PA to one of the most disgusting men in London is mind- numbingly tedious and her career is a constant disappointment to her mother. But it's really okay. She's happy(ish).
So it's not surprising that when Sarah starts dreaming about a handsome stranger, she begins to look forward to falling asleep every night. Reality isn't nearly as exciting. That is until her dream-stranger makes an unexpected real-life appearance, leaving Sarah questioning everything she thought she wanted.