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Denise Achebe staked her department on a pilot program. Two hundred sensors on the city’s worst spans, reading stiffness the way a doctor reads a pulse, and a promise to council that Pittsburgh would never again find out about a bridge the hard way.

On the first Monday in February the system flags a structure that is not on the list. The asset number resolves to nothing. The county roll has never heard of it. And when Denise drives out to Hazelwood at seven in the morning and puts a laser on it herself, the span measures sixty-one feet, two lanes wide, with four thousand vehicles a day crossing a filled ravine on steel nobody has looked at since the Clinton administration.

The record says it is a sixteen-foot drainage culvert. Sixteen feet is below the line where a structure has to be inspected at all.

Somebody wrote that number down on purpose. The signature is thirty-two years old, it belongs to the man who hired her, and the bridge is not the only one.

A suspense thriller about the arithmetic of neglect, the people who carry a city’s secrets in a canvas bag, and what it costs to be the one who finally counts.