In 1935, Antoni Benaiges is hired as a teacher in a small, isolated village in Burgos, Spain. There, he establishes an intense relationship with his students, a group of young boys and girls between the ages of six and twelve, to whom he makes a promise: to take them to see the sea for the first time in their lives.  75 years later, the granddaughter of one of those students discovers the wonderful story hidden behind a promise that was never fulfilled.