Right out of the acts of two popular working performers – Jamie Preston from New Zealand and Paul Brignall from Scotland – comes a stunning book test designed for optimum ease of performance and audience impact It’s the same presentation Jamie Preston has used in his professional shows and. corporate work, as well as on TV. What’s different about The Working Mentalist’s Underground Book Test is that it is structured the way you would do a book test if you really had psychic abilities. You hand out three different paperbacks to three different spectators. One spectator names a page number – any number – and another spectator turns to that page Immediately, you are able to reveal the word or phrase he is looking at You set that spectator’s book