Jonathan's father, Doctor Mordecai, is summoned to Rome to help the plague victims. The four young detectives are wanted too, as the Emperor Titus believes that they can find the mysterious enemy who seeks Rome's destruction.

Can the friends prevent disaster? And what is Jonathan's secret mission?

This is book 7 in The Roman Mysteries .

This book has been graded for interest at 9-11 years.

There are 224 pages in this book. This book was published 2010 by Hachette Children's Group .

Caroline Lawrence is American. She lives with her husband in London.