When a mysterious phone call sends attorney Scott Turnbull on a global quest, he strives to unlock a family secret that concludes in a stunning historical revelation. Travel with Scott as he discovers how a 700-year-old family legend becomes 'the key' to unfolding Leonardo da Vinci's 500-year-old enigma. A scandalous secret hidden in plain sight that some have killed to protect while others risk death to expose. Illuminate the mystery of Knight Rule for yourself and watch as Knight turns into day.