Graham Duglas,the head of MI5, is under attack. With a terrorist group intent on killing him, to make it easier to plan many more attacks, Graham chooses only his best two agents to lead the mission to protect him and MI5. Sydney Jones is knowen to everyone at her work as the best. She's always working her best and aways staying quiet. Being the best has its good points and its bad; everyone adores her at work and she is assigned the best missions, taking her across the world to all the amazing places. Although, with every high there is a low; she has to keep her job a secret from everyone she knows including her family and friends. Also, being the best at her job, there's always that one person wanting to overtake her, stealing the top spot for themselves.. This is where Marcus Black comes in. Always compeating for the best, Marcus and Sydney have never got along. Finding out that they're going to have to work together is agravating for both of them but despite their protests, their boss insists. Can they put aside their differences and work together in the most important mission of their lives?