The Beiderbecke Tapes by Alan Plater

Two easygoing northern schoolteachers — a jazz-loving woodwork master and his politically engaged colleague — accidentally become embroiled in a mysterious affair when they come into possession of incriminating tapes; pursued by shady operatives and bumbling officials, they use humour, music and common sense to unravel a web of corruption and danger, with the story blending gentle social satire, suspense and warm character-driven comedy.