KSC face their worst crisis on this already long history, and must accept any help (no matter the price) in a daring and almost desperate attempt to avoid a tragedy that will render Kerbin's future in check.

Dramas of a past not far enough decide the fate of four Valkyries who resolutely cast themselves into space, defying all risks, to accomplish the mission or to perish in the effort.

Plagi ... uh ... Slightly inspired by Wagner's 'The Ring of Nibelung', the Kerbinautenlied (Song of the Kerbonauts) is a tetralogy of 5 Tomes - Douglas Adams paved the way! :)