The Toymaker's Curse — C.J. Archer

Are curses real? After a toymaker magician gives a lecture at a collector's club soiree, an important spell is stolen and a man is found strangled. The investigation into his murder leads India and Matt to the colorful and dangerous world of the Romany gypsy where curses are used as weapons against their enemies. But nobody seems to know if curses are real or not. As Matt and India close in on the killer, old foes bring trouble into their lives. With the threat of exposure hanging over London's magicians, disaster is never far away. Then one fateful day, catastrophe strikes the Park Street household.