The year is 1997; four entrepreneurs on a Mediterranean cruise propose a challenge to create an object so marvelous, so unique, and so irreplaceable that it would be out of reach for even the richest of the rich. Months later, when Detective Fermin Escartin is invited to a global presentation introducing the Amsterdam Solitaire fountain pen, he has no idea that he is about to become involved in a complicated revenge plot that will lead him from the port of Monte Carlo to Amsterdam, the diamond capital of the world, then to the streets of the old quarter of Zaragoza, his own territory. But this is not a robbery or a murder or anything like Escartin has seen before–he is faced with the seemingly impossible task of solving the perfect crime. El ano es 1997; durante un crucero por el Mediterraneo, cuatro empresarios se imponen el reto de fabricar un objeto maravilloso, unico e irrepetible, fuera del alcance de aun los mas ricos. Meses mas tarde, cuando el detective Fermin Escartin es invitado a la presentacion mundial de la estilografica Amsterdam Solitaire, no sabe que esta siendo involucrado en una sofisticada venganza empresarial que lo llevara del puerto de Montecarlo a Amsterdam, la capital mundial de los diamantes, y despues a las calles del casco viejo de Zaragoza, su territorio natural. Pero esto no es un robo o un asesinato o nada como lo que haya visto Escartin antes–se enfrenta al reto de desentranar el crimen perfecto.