James boards the 23:50 train to Edinburgh. At 23:55 he sends a message to all 158 people in his contacts, telling them that he plans to end his life in the morning. He then switches his phone to flight mode. He's said goodbye. To him, it's the end of his story. But across the world, 158 phones are lighting up with a notification. And for them, the message is only the beginning of the journey. One man's last journey. One hundred and fifty-eight chances to save his life.