Fool’s Ransom

Artemis Arcadia, the notorious art thief, built and programmed robots using stolen military technology to pull off all his heists.
They broke into galleries, museums, and vaults, stole the priceless works, and then escaped using their stealth technology to evade detection and capture.
It was when he wrote the ransom letters that he ran into problems.
The robots didn’t want to give the art back.
They converted a warehouse to an impressive climate-controlled gallery and set up an exhibit of their purloined goods.
Artemis was arrested when the robots publicly advertised a gallery showing and called local caterers for availability.