1978 film by Radim Cvrček

Energetic Dr. Alice Váňová becomes the pit doctor at Mír Mine and spearheads a silicosis prevention study requiring miners to drink milk regularly. The miners, led by a tight-knit group, stubbornly refuse public participation. Determined union chair Janeček resorts to psychological tactics and pressure campaigns to force their compliance, turning a health initiative into a tense battle of wills.

An adventurous letter that wandered around the world instead of rushing to a summer camp to see its little recipient.