His name is synonymous with great literature. Author of timeless masterpieces like "Romeo and Juliet," "Othello," and "Hamlet," William Shakespeare is widely considered to be the greatest writer who ever lived--or was he? FRONTLINE producer Michael Rubbo explores anew the centuries-old controversy over whether the literary masterpieces long attributed to Shakespeare were actually written by his contemporary, Christopher Marlowe. Born in the same year as Shakespeare, Marlowe was at the height of his literary career in 1593 when he was supposedly killed in an argument over a tavern bill. Marlowe's death, however, has been clouded in mystery, with some "Marlovians" insisting the playwright lived to write another day--but under the name of Shakespeare. FRONTLINE takes viewers inside this 16th century detective story in an attempt to unravel what some are calling the "biggest cover-up in literary history."