Anton Lesser reads JB Priestley's atmospheric war-time thriller, set in a Midlands town during the blackout.

With an aircraft factory and an electrical works busy with war work, it soon becomes apparent that sensitive information is being leaked to the enemy. An undercover operative is sent in to discover what's going on, and he finds himself surrounded by black marketeers, fifth columnists and an assortment of servicemen and civilians.

As he tries to make sense of this strange cast of characters, his investigation is hampered by a murder. He realises that this uninspiring-looking town harbours some sinister secrets hidden in the dark of its wintry blackout.

Abridged and produced by Jane Marshall
A Jane Marshall production for BBC Radio 4. Show less