The expression "Code Blue" is an announcement of a cardiac arrest in the hospital, something like an SOS that doctors use, a notification of a death visit that calls the rescuer to hurry quickly in case they can bring life back to the clinically dead body while the soul has already begun to travel to the underworld.
All the fantastic stories contained in this book are based on real events and experiences of the life of a militant cardiologist but also of a person who is concerned not so much about death as about the kind of life each of us lives before departing definitively for the dark Land of the Cimmerians, as depicted by Homer in the masterful rhapsody XI of the Odyssey. The story titled "Code Blue" was written on the occasion of the inexplicable death of a 35-year-old doctor and precious friend who left an irreplaceable void, you see that even doctors die young. [...]

(from the author's preface)