Detective Sergeant Kirstin Toogood tapped her slender fingers on the steering wheel. Traffic lights were red. She could have walked. She should have walked. She was only going next door after all. However, a superior officer told to go by car. Now, with roadworks on Victoria Street forcing a diversion, she’d wasted time crawling round the snarled up one-way system of Parliament Square. Getting stopped at every sodding light.

She stewed over the reason for her trip. It was not ple...