A who-is-it setting in the claustrophobic corridors of an abandoned and locked-off office building that has several guests invited to a party by their mysterious, unknown host. Only it is they who are the victims of their crimes. Suspense and mistrust are not the only stalker in this cat and mouse game of wits and fear. Who is the stalker? Why is he killing? And what is it exactly that everyone here has in common?

How I Live Now and A Long Way Down writer Thorne has scripted the thriller about the aftermath of an international nuclear attack, played out in the political backrooms of London.

Raimund Gregorius, having saved a beautiful Portuguese woman from leaping to her death, stumbles upon a mesmerizing book by a Portuguese author, which compels him to suddenly abandon the boring life he has led for years and to embark on an enthralling adventure. In search of the author, Gregorius acts as detective, pulling together pieces of a puzzle that involves political and emotional intrigue and the highest possible stakes. His voyage is one that transcends time and space, delving into the realms of history, medicine and love, all in search of true meaning to his life.