CD4 - 2 CD4 - 20 CD4 - 20. The Adventure of the Priory School CD4 - 21 CD4 - 21. The Adventure of the Priory School CD4 - 22 CD4 - 22. The Adventure of the Priory School CD4 - 23 CD4 - 23. The Adventure of the Priory School CD4 - 24 CD4 - 24. The Adventure of the Priory School CD4 - 25 CD4 - 26 CD4 - 27 CD4 - 28 CD4 - 29