His breakthrough came in 2010 with Malstrømmen (The Maelstrom), the first book about police investigator Rino Carlsen, set in Lofoten where Granhus himself lived his entire life.
Hans genombrott kom 2010 med Malstrømmen, den första boken om polisutredaren Rino Carlsen, i Lofoten, där Granhus själv levde hela sitt liv.