Some DynEd - BBC thing from 2001. Had this at school as a child.

It's so bad yet so nostalgic, hope this helps preserving it.

The site can be accessed on https://web2.dyned.com/us/products/thelostsecret/ (it's archived here)

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The Lost Secret is a video-based, supplementary course in spoken English. This breakthrough English language course provides listening and speaking tasks that motivate students to learn English in new ways. Originally filmed and published by BBC English, this course has been honored by the French Ministry of Education.

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Overview

The Lost Secret is an engaging mystery story that has become a favorite of students and teachers around the world. Now, with the interactive features provided in this version, the course is a major step forward in English language teaching software.

The story begins with a man who has lost his memory. Unable to answer such questions as "Who are you?" and "What is your name?" he is taken into the care of a doctor and a police inspector who try to help him recover his identity. The action ranges from Europe to South America and revolves around the secrets of a mysterious lost culture.

Within this exciting drama, the English language is presented and sequenced through a complete structural and functional syllabus, beginning at an elementary level and progressing to an intermediate level. The language used throughout is British and American English, spoken naturally and in context by a cast of highly-acclaimed actors.

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Episode list:

Episodes 1 & 2: Who is he?
Episode 3: Who is Sabina?
Episode 4: Footprints in the Sand
Episode 5: One o'Clock at Alfredo's
Episode 6: The Laboratory
Episode 7: Good News and Bad News
Episode 8: Male and Female
Episode 9: We Have to Stop Him
Episode 10: The Drug
Episode 11: The End