Ka taƙaita labarin:  Yana ci gaba da gwagwarmaya don kare mu daga ta'addanci da kuma sauran manyan barazana a duniyar zamani. Don haka kuna iya tunanin MI5 na da abubuwa masu mahimmanci da za ku damu da su fiye da gudanar da gasa ga masu kallon Blue Peter don zuwa "makarantar leken asiri". Amma wannan shine ainihin abin da ya faru, bayan da matasa uku suka lashe gasar don ziyarci hedkwatar MI5 a London. Har ma yaran sun halarci ganawa da babban darektan tsaro Andrew Parker. 'Yan takarar da suka yi nasara tare da Andrew Parker na MI5 (hagu). An ba wa kungiyar izinin shiga hedkwatar hukumar. An zabi matashin Bonds (wanda aka gani a nan wanda Daniel Craig ya buga) daga cikin sauran masu fata 5,700. Jamie, mai shekaru 13, Reuben, mai shekaru 13, da kuma Finley mai shekaru goma an zaba su bayan jerin "gwaje-gwaje masu wuya" don nuna cewa su matasa ne masu leken asiri. Sunan code Project Petra, shirin shi ne karo na farko da aka ba da damar yin fim a cikin ginin MI5. Ya zo ne a lokacin da hukumomin leken asirin Burtaniya suka fi kowane lokaci aiki fiye da kowane lokaci don yakar barazanar daga Al Qaeda, Daular Islama da Rasha. Kuma ikon su na bin diddigin 'yan ta'adda na kasashen waje da na cikin gida da kuma sa ido kan hanyoyin sadarwar su ya lalace sosai saboda kwararar bayanan sirri da tsohon leken asirin Amurka Edward Snowden ya fitar. Kimanin yara 5,700 ne suka nemi shiga gasar, wanda hakan ya sa ta zama daya daga cikin shahararrun a tarihin Blue Peter. Matasan 'yan takarar sun kammala jerin kalubale kuma sun burge kwamitin yanke hukunci wanda ya kunshi marubucin yara Anthony Horowitz, mai gabatar da shirye-shiryen talabijin da kuma dan jarida Sonali Shah da Farfesa Christopher Andrew, jami'in Tarihin Tsaro. 'Yan wasan karshe sun warware jerin alamomi don gano wurin da' makarantar leken asiri'a Manchester. The sa'a uku tare da Darakta Janar Andrew Parker (a hagu) da kuma Blue Bitrus mai gabatarwa Barney Harwood (na biyu hagu) A makon da ya gabata ta episode, takwas finalists ya karya lambobin don kafa wuri na "spy makaranta", wanda aka kafa a cikin ofisoshin na lissafin kudi m KPMG a Manchester. Kuma a jiya, 'yan takarar sun kasance...
Jamie, mai shekara 13, Reuben, mai shekara 13 da kuma Finley, mai shekara 10, suna kan hanyar zama 'yan leƙen asiri. An yarda da kyamarorin talabijin a hedkwatar London don wasan yara. Trio har ma sun hadu da babban darektan tsaro Andrew Parker. Stunt ya zo tare da MI5 ya fi aiki fiye da yaƙi da ta'addanci da kuma tashi na Rasha.