The surly but brilliant police inspector known as "The Lens" has spent her entire career putting thieves and burglars behind bars... but only one of them was ever skilled enough to evade her. "The Magpie" is a masked pony responsible some of the most daring and spectacular thefts in Equestrian history, and despite his fame nopony knows who he is or what he wants.

After seven years of pursuit, Inspector Spectacles is determined to stop his most brazen heist yet and put him in prison one and for all... but nothing is ever so simple. Even in defeat, the charming and enigmatic pony has the city of Canterlot in an uproar. Although the Inspector knows everything about his methods, she must now unravel the truth about his personal motives—and in so doing, face a fearful moral quandary.