The institute is in full swing as everyone prepares for Alec and Lydia's wedding. But not everyone is celebrating as relationships are tested. Clary and Jace struggle to come to terms with their newly revealed past. Alec is confused with his feelings for Magnus especially when Magnus won't give up on him. Magnus, Clary, and Jace search for Ragnor Fell, a warlock that may hold the antidote to wake up Jocelyn .