'Lucky Cards' can be found in Roy's lecture notes: 'Be My Guest', which is now out of print I believe. The basic effect is a little like the original 'Fred' trick (or 'Phil' trick by Trevor Duffy which is sold today). Roy's however, is a
version I personally prefer: it's very commercial, especially for restaurant work; there's a great deal of fun to be had from it and, it is a very strong effect considering all you need are a pack of cards, two matching Jokers
and a marking pen. excellent!