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The world's most deadly poison is stolen from MI9 and the spies suspect that the culprit is eccentric puzzle maker Quillian Pendrix. As Pendrix-mania sweeps the nation, the spies must crack the puzzle and retrieve the poison.
When the spies discover the existence of a SKUL school, they send Oscar on an undercover mission. However, as he wins the admiration of his teachers, he is tempted to join SKUL for real.
MI9 are on high alert when they learn that an enemy spy has stolen a jacket enabling him to look exactly like a school pupil. As the imposter heads to St Hope's, will the spies be able to identify and stop him in time?