The wet Tuesday test.

Somewhere in a very good kitchen tonight, a grown adult who commands a brigade of twenty and owns knives worth more than my first car fears a man dining alone with a paperback.

The man might be a Michelin inspector. Nobody knows. That is the entire point of them. They book under false names, eat alone or in unremarkable pairs, never announce themselves, and always pay the bill. Some kitchens keep photographs of suspected inspectors pinned up by the pass, like a police incident board, except the crime is ordering the turbot.

And the detail most people miss: the inspector isn't scoring the fireworks. Michelin famously rates consistency. Not the best plate the kitchen can produce on its best night, but whether it can produce that plate on a wet Tuesday, twice. The show plate gets you noticed. The ordinary service gets you the star.

Companies run exactly this paranoia once in a while, and they call it hiring. When a senior candidate is in the building, everything is inspection night. The panel rehearsed, the rooms booked, the glasses of water at right angles, the CEO suspiciously available. For three months, every plate is perfect.

Then she signs. And the kitchen relaxes.

Which is odd, because the inspector has just booked a table for five consecutive days, under her real name this time. The reservation is called week one.

I watched one of these inspections from the outside. On the Sunday night before she started, a commercial leader I placed read her week-one calendar the way an inspector reads a menu, because it was the only thing her new employer had produced without once thinking about how it looked. It told her the head of clinical affairs had booked in before she'd even been issued a security pass. It told her the CFO had accepted the introduction meeting, then moved it twice. And one direct report hadn't booked at all. Regular readers will recognise him. Edition two. The rival, at his usual table.

Nobody in the building said any of this out loud. Nobody needed to. The wet Tuesday said it for them.

Psychologists have known since 1993 that people form durable, accurate judgments from thirty silent seconds of behaviour. Nalini Ambady and Robert Rosenthal proved it with soundless clips of teachers; the field calls it thin slicing. Thirty seconds. She's getting five days.

So here's the takeaway, and it is the whole trick: you are not judged on inspection night. You are judged on the service you put out when you're certain no inspector has booked. Every company knows this about restaurants. Almost none remember it about themselves.

Pull the week-one diary of the last senior leader you hired and read it the way she did, knowing nothing except what it showed. Who booked in unprompted. Who moved the meeting. Who never showed. That's the inspection report. It just never occurred to anyone to ask for a copy.

One last thing, because it's too good to leave out. The Michelin Guide was invented by a tyre company, and not as a hobby. Michelin wanted people to drive further, because people who drive further wear out tyres sooner. The stars were never for the chefs; they were there to put miles on your car. Remember that, because your new leader's verdict isn't for you either.

It's what she'll use to decide how long she stays.