Art Gallery Owner Murder Case

Conan, Ran & Kogorou visit an art gallary which is on the verge of being closed down after being bought by a businessman who intends to turn it into a hotel. While they are looking around they stumble accross the impaled body of the businessman and after watching the security video they find out he was killed by a someone in a suit of armour. Luckily the victim was able to right a clue on a piece of paper before being killed.