The television reports that the shuttle "Columbia" has suffered an accident when returning to earth after a lunar expedition. In the news there is a drawing that one of the astronauts had brought: the terrestrial globe seen from space. Daniel, a boy who lives in Prague, recognizes the drawing and believes that there are several similar ones in his father's storage room. Indeed, there he finds a box with sheets and notebooks signed by a certain Petr Ginz.

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Petr was a boy who probably lived in that house in 1941 when the Nazis occupied the city. Daniel, who is the same age as Petr, reads with disbelief what life was like on the streets where he walks. The voice of the two boys begins to merge and the boundaries between the present and the past seem increasingly blurred.

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Daniel wonders what to do with the testimony he has found by chance, if there will be any survivors of that Jewish family to give Petr's belongings to, or how to preserve this piece of history.

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