Vince had never considered himself a tech-savvy person but lately he was surprising himself with what he could work out. Finding his way around computer systems had been part of being a police officer, but more recent technology such as navigation on mobile phones wasn’t around back then. His maths was strong, and his father was a carpenter so he’d learned from a young age how to calculate measurements. What he was doing now was simply a mixture of several skills. He had a map of the city laid out on the kitchen table, folded to show the western suburbs out as far as his home and back across to Lygon Street in Carlton. He’d downloaded his travel record to his computer and moved the data to a spreadsheet showing start and end points, distance, time. With a black marker and ruler he traced

