London, 1945. The capital is shrouded in the darkness of the blackout. During a stroll through Regent's Park, Bruce Mallaig witnesses two men acting suspiciously. In a matter of moments, one of them has been murdered. The murderer's noiseless escape seems to defy all logic, and even the victim's identity is thrown into uncertainty. Lorac's shrewd CID man MacDonald must set to work once again to unravel this near-impossible mystery. A British Library Crime Classic.