The facts took place at the end of 2015 in the quiet town of Moëlan-sur-Mer, in Finistère.
That day, a septuagenarian saw several individuals arrive at her home.
They abuse her, threaten her with a crowbar and lock her up for an hour.
The old lady does not interest them however.
What they come for is a priori hidden in the glass wool of the house, where the grandson of the owner hides heroin, reports Le Télégramme.
Seven years after the events, the man responsible for this commando and his accomplices were tried before the criminal court of Quimper.
According to the Breton daily, the leader would have met the grandson of the victim in prison, well known for drug trafficking.
This is where he talks about the heroin hidden in the grandmother's house, the equivalent of 80,000 euros anyway.
On Monday, the five men sitting in the dock were convicted.
All repeat offenders, they received sentences of one to three years in prison.
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Quimper
Brittany
Heroin
Sequestration
Dope
Heist
Flight