Ollie and Moritz are two teenagers who will never meet. Both are dealing with life-threatening illnesses. For Ollie, contact with electricity leads to paralyzing seizures, while Moritz depends on an electronic pacemaker due to a heart defect. If they were to meet, Ollie would have a seizure, but disabling the pacemaker would be fatal for Moritz. Through correspondence, the boys develop a strong friendship that helps them through difficult times. This bond of trust is tested when Moritz reveals that he holds the key to their shared, dark past, a information he has always hidden from Ollie.