In show business, a "triple threat" is a performer who can sing, dance and act -- and that makes Neil Patrick Harris, who is all these things and the author of an inventive series of books for young readers, a quadruple threat.  The star of Netflix's A Series of Unfortunate Events joined Josh Perilo from B&N's Union Square, just before the launch event for The Magic Misfits: The Second Story, the latest adventure in his delightful series for young readers, what readers can find in the B&N Exclusive Edition, and how he is infusing these stories with his love for the mystery of stage magic.