A Dangerous Game. The Peabody Adventures, #2

Scruggs Grady is about to have his dream come true: a home of his very own. But disaster strikes when a mysterious aunt pops up and whisks him away from the cold but familiar snowbanks of Wisconsin to the bustling streets of San Francisco. To muddle things even more, a secret note warns him to beware of the "Juggler!"In the second book of the Peabody series, Scruggs finds himself caught in the middle of a ring of international spies, and they are trying to get rid of a stolen piece of technology.
He has to decide who to trust among the strangers he meets, and he has to rely on his wits and courage as he tries to find a way back to the home he has longed for in Peabody, Wisconsin.