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While French and Belgian sleuths searched furiously for the culprit, one Albert Frank Heine got on a train at Amsterdam. Arriving in Brussels he was immediately arrested and rapidly confessed that he alone had concocted the forgery. An interview with Heine, containing his confession, appeared in Le Soir of Brussels even before he was arrested. "My grandfather was Heinrich Heine, the poet," said spy Heine, "and I did this as one of history's most remarkable jokes." Observers wondered, "on whom?"