When England's largest castle is robbed by a notorious crime boss (Jon Campling, Harry Potter's Death Eater), the last thing he and his criminal gang expected to be up against were two boys on BMX. When the boys' mother (Angela Dixon, Never Let Go) leaves her sons with their Speedway racer father for a trip back to San Francisco, their 'old school' dad disapproves of their time on their phones and instead reminds them of the excitement or real life adventure. A twist of fate leads the boys to discover the diamond heist, but in the process, their father is arrested for the crime, sparking a race against time.