Unlock by Mark ElsdonMark Elsdon is my secret weapon. Well, he was until I told you about him. He's the first, and usually only, person I turn to when I get stuck. Why? Because he constantly finds unique and practical solutions to creating astonishing magic. The man's brain is a goldmine of quality ideas and material. Colin McLeodMark Elsdon is equally adept at inventing, performing, creating, and theorizing about magic. He consults for television, lectures, and performs,