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a dark horse

1. someone with a secret, especially a secret ability, skill, or achievement, that surprises you when you finally discover it
Synonyms: mystery, riddle, uncertainty, mystery, puzzle

2. someone who wins a race, competition, election etc that no one expected them to win
Synonyms: winner, champion, laureate, record-holder, medalist.

una incógnita

secretive  adj
[person] reservado, callado
[behaviour] reservado
[organization] hermético
to be secretive about sth