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 shes back on the street looking to settle old scores. CHERUB agents Ryan and Ning need Fays knowledge to unearth a major drug importer. Theyre trained professionals with one essential advantage: even experienced criminals never suspect that children are spying on them. But Fays made a lot of enemies and shes running out of time ... For official purposes these children do not exist.