The Magic Thief: Lost

Connwaer is back in the second installment of Sarah Prineas' trilogy, The Magic Thief: Lost. In the first book Conn sacrifices his locus magicalicus to save the city of Wellmet and the magic that lives there. Now, without his locus stone the magisters feel there is no reason for him to continue on as Nevery's apprentice. But the magic has other plans for Conn when it begins to be drained yet again and people begin to be attacked by Shadowmen and turned into stone. Now it is a race against time to save not just the people of the city, but to once again try to save the magic itself. Just one problem, how do you save an entire city with no locus stone and the only way to communicate with the magic is to use pyrotechnics, which happen to be illegal?