Whodunnit?

Inspired by Alex Rider in our Stormbreaker class novel, Year 6 are currently acting as secret agents and are working hard to crack a tricky case. We know that a hard drive containing valuable secrets has been stolen, and we know that there are four suspects who could have been responible. Which one was it? Who did the crime? Who has the hard drive? Year 6 are compiling their evidence and will soon need to choose who they think is responsible...