In the aftermath of the fire bombing, Robert Lusser’s family finds shelter in an abandoned mansion while he heads to a remote island in the Baltic Sea. This is where he must perfect his "wonder weapon" - a never before seen flying bomb that will become the world's first cruise missile. In their search for how their grandfather managed this achievement, Stephanie and Suzanne go behind the locked gates of a ruined military base with an engineer-turned-historian who knows exactly who their grandfather was - and what he did.

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