The Irrational Diary of Clara Valentine

Clara's last year at school is shaping up to be uneventful, aside from the stress of uni applications. Until one day, classmate Ty (on whom she happens to have a pretty big crush) asks for her help. His computer genius brother has just disappeared, leaving behind a laptop to which access is granted only when you answer a maths question - and maths isn't exactly Ty's strong suit.

One question turns into many when Clara and Ty follow his brother's trail and start spending a whole lot of time t...