Fay has spent eighteen months locked up in a Secure Training Centre.

Drug deals and rip-offs are the only things this teenager knows.

Now she's back on the street, looking to settle old scores.

CHERUB agents Ryan and Ning need Fay's knowledge to unearth a major drug importer.

They're trained professionals with one essential advantage: even experienced criminals never suspect that children are spying on them.

But Fay's made a lot of enemies and she's running out of time ...For official purposes, these children do not exist.