All her life, Susan's loved ones have been hiding a terrible secret from her: If she thinks too hard, her head will explode.Luckily, her devoted boyfriend, anxious parents and fierce best friend are prepared to do whatever it takes to keep Susan safe in ignorant, thoughtless bliss. And until now, Susan has lived happily in a bubble of TV and takeaways, social media and small talk; anything to distract her from the spiralling thoughts that so often haunt the rest of us - thoughts that would be deadly for her.But what happens when reality creeps in and Susan's perfectly curated world starts to crumble? Can we distract ourselves from the real world forever... and should we?