Andrew's mother, Marion, works for Epsom Electronics, a security company that makes high-tech spy gear to keep world leaders safe. When she goes missing on the eve of a G8 summit in Halifax, Andrew and his father work desperately to find her. Luckily, Andrew and his best friend, both thirteen, are no strangers to danger, and they follow Andrew's instincts—which run directly counter to the instructions his father gave him.<br><br>When the two friends are nearly caught in a huge explosion at Citadel Hill, Andrew realizes his mother could be in even deeper trouble than he thought. Enlisting help from a credulous news reporter, the boys chase clues all over the city, narrowly avoiding serious harm on many occasions. <br><br>Finally, they uncover a top-secret assassination plot—but are they just in time, or just a little too late?