When a valuable masterpiece is stolen, Dan Robinson and his friends, calling themselves the Baker Street Irregulars, investigate the scene of the crime, piece together random clues, and finally corner the two criminals

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A group of young English sleuths help the police uncover a ring of teenage criminals masterminded by an older gang of crooks.

The famous Baker Street Irregulars are back and in fine form! They need to be to solve their most challenging case to date. The new Dalmatian Ambassador has disappeared from his own Embassy in highly suspicious circumstances. Could he have defected? Or has he been kidnapped? Why does the Embassy deny that anything is wrong? Dan Robinson and his friends are worried. The Ambassador, Slavko Peskovitz, is a personal friend of theirs and they’re sure he’s in danger. Then Dan gets a cryptic note from Slavko’s wife—she’s a prisoner in the Embassy! Dan, Jeff, Liz and Mickey spring into action with a daring plan which involves getting inside the Embassy. What will they find there? The Irregulars are soon caught up in a frightening world of secrecy, espionage and counter-espionage, a world where friends can be enemies and enemies will stop at nothing.