Josh knew that life in one of the Upper Cities wasn't going to be easy to get used to, but never did he plan on investigating a series of murders together with his roommate, Ayria Hawthorn. Three Senior Engineers have been killed in a way sacrilegious to everything logical reasoners hold dear - with Magik. In a City where Science and Magik exist in an uneasy truce, the smallest imbalance might send everything spiraling out of control, resulting in an all-out war between the two Guilds. Unless Ayria and Josh can find the Summoner responsible and turn him over to the Watch, chaos may soon reign unchecked in Old London...