Triquetra consists of three routines: Conserving space, Marathon, and That's Not Fair.

Conserving Space - Produce a number of small items and a deck of cards... from a single card box. Can be performed sleeveless and surrounded.

Marathon - A strong, multi-phase routine of transpositions, color changes, a 'Card-At-Any-Number, and a Card-to-Box finish. You will also learn a new color change, called the AA Change.

That's Not Fair - You write a prediction on the back of the card box. A spectator selects four cards, mixes them, then picks one of the four. You reveal your prediction, THEY turn over their chosen card, and it matches your prediction. There is no equivoque/'Magician's-Choice' involved in the selection.
You will learn a utility move, other applications of that move, and a performance idea that can be used on Halloween. Teaching also includes a gimmick-less 'Any-Card-to-Box', that can be used as a second phase.