The book's thrilling plot revolves around the very public suicide of a woman who has been doing research on Isaac Newton's theories on alchemy. Her estranged former husband, the troubled mathematician Even Vik, soon realizes that she has left behind a serious of clues that nobody but he is able to decipher.

The rights to The Invisible Brothers has so far been sold to Denmark, Holland, France, Germany, Korea, Russia and Spain.

Oh yes, the crime mystery The Invisible Brothers has what it takes and more than that … The Invisible Brothers is entertaining all the way … Let’s hope that we haven’t heard the last of Even Vik, our both wise and violent rascal from Oslo, who can headbutt here, slap a few faces there, and conquer a lovely woman, who even though she offers herself to him and lets him have his way with her, still proves to be as fatal as strychnine on a harmless piece of sandwich.
(Bo Tao Michaëlis, Politiken)

Those who are looking for new, sensational revelations about Newton will be disappointed by this book. The one who turns out to be the real mystery of the book is Even, which is no mean feat. Through Aust’s writing, the number-crazy and witty mathematician is brought under the reader’s skin, and as his history and past is revealed, Even gradually steals the show from Newton. The book changes into a thrilling love story about finding the courage to live.
(Mette Strømfeldt, Berlingske Tidene)

The Invisible Brothers is first and foremost a exciting novel which is hard to put down. The language flows easily, and you move quickly through time and space. One moment you’re in today’s Oslo, the next you’re in 17th century England. Danish-born Kurt Aust executes his story very well, so if you’re into mysterious crime novels, this book must be the next on your crime-list.
( Marie Mærsk, Bogrummet.dk)