CLEAN : Dutch art detective finds rare stolen copy of Prince of Persian poets

The transcript narrates the intriguing story of an Iranian man living in Munich who appeared poor but was secretly wealthy, having collected valuable manuscripts over decades. After his death, his collection was stolen, leading to a police investigation. A significant book, 'The Divine of Harvest,' was missing, prompting a search involving international parties. Eventually, the book was recovered, highlighting its historical importance as one of the earliest copies of a famous work from 1462.

Why did the informant contact the narrator?

What was the narrator's plan to solve the issue regarding the stolen book?