Alison - still recovering from her near-fatal accident - finds herself hounded by the ghostly gaggle, who now realise that she can both see and hear them. With Mike assuring her that these visions are exactly the sort of side effect her doctors warned her about, Alison tries to ignore their existence - a tactic which only exacerbates the problem, as the long-dead army captain puts the ghosts onto a war footing.
Meanwhile, Mike's attempts to turn the old house into a home leads to a DIY disaster, saddling Lady Button with an ill-suited roommate. And the ghosts are introduced to the internet, allowing Julian to learn about his questionable legacy.
The crumbling country pile of Button Hall is home to numerous restless spirits who have died there over the centuries - each ghost very much a product of their time, resigned to squabbling with each other for eternity over the most inane of daily gripes. But their lives - or, rather, afterlives - are thrown into turmoil when a young urban couple - Alison and Mike - surprisingly inherit the peaceful derelict house and make plans to turn it into a bustling family hotel. As the ghosts attempt to oust the newcomers from their home, and Mike and Alison discover the true scale of the project they've taken on, fate conspires to trap both sides in an impossible house share, where every day is, literally, a matter of life and death.