When former lawyer Jan de Fries goes crabbing in the North Sea with his friends Uz and Onno, he has no idea that just a few hours later he will be staring into the empty eye sockets of a dead woman. For the investigating detectives Hahn and Mackensen, it is clear from the start that the deceased died in a sailing accident. However, Jan and the sister of the deceased, Eva Ehrlich, are convinced that it was murder. Initially, Jan refuses Eva's request to investigate the circumstances of her sister's death. But Eva's blue eyes and the emergence of a second water corpse in the harbor of Norddeich compel him to fulfill the desperate woman's request. Especially since the second, unknown victim was not drowned in the North Sea, but was killed in a particularly diabolical and treacherous manner. "Granat für Greetsiel" was published in February 2014.