In Tell Me the Planets, Ben Platts-Mills shares stories about his remarkable work with survivors of brain injury, offering a rare glimpse into the world as seen through their eyes. We meet charismatic Danny, whose criminal past has left him paralysed down one side, but who now helps others worse off than himself; Sid, whose memory for the present lasts only moments; and Liah, who is caught in a battle with the care system threatening to make her homeless. But above all this is the story of the extraordinary friendship between Ben and Matthew, who suffered neurological damage during an operation to remove a cerebral cyst. It is a journey that takes them to the frontiers of science and to the limits of human resilience: when they discover that the cyst is growing again, Matthew is left with an impossible decision to make.