Because none of them was as brutal as all of them.
After a stretch of captivity Blunt decides Alex needs a little more training and where better to do it than the famed Hendersons Academy for Sports and Language, aka. CHERUB
When Rue and Cinna go digging in the meadow they discover a... rather interesting object, but what does their mother know about it, and why is she so terrified when a secret admirer leaves her a single red rose? Surely, that's a good thing?