You must collect a case from a locker at the station, hand it over to your contact, and get back to the airport before the last aeroplane leaves.
Your computer will tell you where your contact will be and at what time. You must leave a message at that place, before he gets there, telling him where and when you will meet him to hand over the case. You must find out the password before you meet him, and make sure to be no more than fifteen minutes late.
Before you can get the case you must find the key to the locker and also its number. Unfortunately the key is in the hands of enemy agents, whose HQ is at the Hotel. You must find an enemy spy and follow him, hoping he will be careless enough to drop the key and that he will not see you.
A free PDF of the book is available for download from Usborne Publishing (scroll to near the middle of the page).
As well as the listing, the book contains a map showing all of the places you can visit and lists all of the words you can use in the game.
As well as all the versions officially detailed in the book, conversions to other microcomputer BASICS exist.
The game has been ported to VZ200.
[+] Users who have solved this game
[+] Users currently playing this game
Vic20 + 8kb extension can be downloaded here: http://www.vic20listings.freeolamail.com/book_compspygames.html#rdv
Unusual little game, it's technically an adventure but the path to completion is pretty linear (although the locations are randomised). After struggling to complete it for a while I realised it helps to leave a message for your contact straight away, before you potentially waste too much time getting the key!