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Der Goldschmied Muhammed Karat wird 50! Seine Frau Barbro hat für ihn und seine Gäste einen Abend voller Überraschungen im Stadthotel von Valleby organisiert. Doch inmitten der Feierlichkeiten entdeckt Barbro, dass ihre Halskette mit dem wertvollen Diamanten verschwunden ist. Zum Glück sind Lasse und Maja unter den Gästen, um zu ermitteln ... Einfach zu lesen - knifflig zu lösen!

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Martin Widmark ist in Linköping, Schweden, aufgewachsen und lebt in Stockholm. Er ist ein begeisterter Fußballspieler und mag Essen, Sprachen, Menschen und Musik. Nachdem er 10 Jahre Lehrer für die Mittelstufe war, unterrichtet er heute Schwedisch für Einwanderer an der Volkshochschule.

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Martin Widmark was born in 1961 in Sweden and today lives in Stockholm with his family. He has worked as a middle school instructor and a Swedish teacher for immigrants, but he is now a full-time children´s book author. Over his career, he has also written several textbooks. He is fascinated by life´s little oddities and anything unique, from food and music to languages and people. Widmark is considered a literary giant of contemporary children´s fiction in Sweden. Both his Nelly Rapp and LasseMaja series are consistently on the bestseller lists and have received critical acclaim. His books have been translated into more than 20 languages.

Helena Willis was born in 1964 in Stockholm, Sweden, and now lives outside the city with her husband and two daughters. She´s been working as a freelance illustrator since she graduated from Beckmans College of Design in 1991.

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