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Current national threat level: SUBSTANTIAL Read more about threat levels >>

MI5 101 This mission will test how much you know about MI5, what we do, and our history. Get five correct answers in a row to move onto the next mission.
CODE BREAKER This mission will test your analysis and communication skills. You’ll be asked to decipher coded messages sent by your agent in emojis. Crack the four encrypted messages to move on to the next mission.
CODE BREAKER
Intelligence Debrief This mission will put your memory and judgement skills to the test. You’ll have ten seconds to look at some items of interest to an investigation, and will then be asked a series of questions based on what you saw.
Intelligence Debrief

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MI5 Director General and Head of CT Policing give joint interview for podcast

MI5 Director General Ken McCallum and head of Counter-Terrorism Policing Neil Basu gave their first joint interview for...

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MI5 logo with purple and blue background

MI5 joins Instagram

MI5 has joined Instagram with the aim of lifting the lid on what it's really like to work at the Security Service.

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