From bestselling historical fiction author MJ Porter, the new gripping historical mystery set in 1940s Erdington, for fans of Helena Dixon, Emily Organ, L.B. Hathaway and Michelle Salter.

Birmingham, England, December 1944.

Chief Inspector Mason of Erdington Police Station is summoned to the Dunlop Rubber Company by an irate Mrs Adams from the Buying Department on a cold Tuesday morning in December 1944.

No sooner have he and O'Rourke managed to uncover the cause of Mrs Adams' telephone call to the police station, than events take a far more chilling turn than the rogue situation's vacant advertisement first alluded. It might just be that they're in the right place at the right time to prevent a terrible tragedy. Or are they?

As the barrage balloon threatens to break free from its winch truck in the terrible wind, Sam Mason makes a most unwelcome discovery. Who killed the man, but more importantly, how did he end up, roped to the barrage balloon? And with the WAAF denying their involvement, how was the barrage balloon even floated? What does it all mean? And when they discover the secret tyre formula from the Testing Department has also been stolen, Sam starts to fear there is even more at stake.

Join Mason and O'Rourke for the fourth book in the quirky, historical mystery series, as they once more attempt to solve the impossible in 1940s Erdington.