In the main plot, Derren's "treat"-victim is 75 year old Anne, whom he teaches to play poker at a professional level in just one week, so she can play and win at a world class poker game. Side plots include Derren giving a waxwork experience to visitors of Madame Tussaud's and changing a person's perception of colours.
In the main plot, Derren's "Trick Or Treat"-victim is 21 year old Yshani, whom he teaches to play the piano to concert standard in one week. In the end, she gives a piano recital at London's Wigmore Hall. Side plots include Derren "transmitting" a four letter word to Simon Callow and Derren performing as a psychic waiter at a steakhouse in New York.
The subject, guest star David Tennant, appears to have the ability to time travel. He is taken back to the early 1930s and gives out facts, which appear in a newspaper from that date. He then predicts what a member of the public will draw on a card, twenty minutes beforehand. Finally, he performs automatic writing, predicting a news item which would appear four days later in The Guardian newspaper.
Derren attempts to transform IT worker Jason from a nervous doubter to a confident go-getter. He teaches Jason a number of life-enhancing techniques that unlock the secrets of powerful confidence. Derren has Jason experience a potentially embarrassing speed-dating event - twice. And then he has one final surprise in store...