Fair Trade (Sequel to "Read Between The Lines")

A year or so after Nick's encounter with a never-before-seen Wesen... Juliette and Nick are engaged and in the thick of wedding planning. Meanwhile, the Royals are willing to do anything to get the key he holds.
Juliette wants to do something nice for Nick to celebrate. When she finds an antique from Aunt Marie, she trades it with the best intentions.
An old enemy returns, and Nick finds his luck running out. Can he outwit an enemy who knows his every move? Will this be "The End" for the Grimm?