During World War II, two allied soldiers escape from a Nazi POW camp to Lyons, where they accept the hospitality of mademoiselle Helene.
Unfortunately the movie Letters to an Unknown Lover is not yet available on HBO Max.
| Directing | Peter Duffell | Director |
| Writing | Pierre Boileau | Novel |
| Writing | Thomas Narcejac | Novel |
| Production | Ian Warren | Producer |
| Sound | Raymond Alessandrini | Music |
| Crew | Claude Robin | Cinematography |
| Editing | Teddy Darvas | Editor |
