Selection by Olga Drennen

Dear friend, when you open this book, don't trust your luck. Don't trust because there are crimes and misteries that, maybe, you won't be able to solve. 

Because each enigma represents a challenge to your intelligence. You will have to be very alert when Germán Cáceres, Olga Drennen, José Montero, Mercedes Pérez Sabbi and Franco Vaccarini challenge you with their stories. That's why, dear reader, when you open this book, you shouldn't trust your luck.