In the sports documentary series "Best when it counts", we closely follow the established big stars, such as Linn Svahn, Ebba Andersson and Frida Karlsson, together with the upcoming stars in the Swedish cross-country national team's WC season 2020/21. For the Swedish cross-country team, everything is at stake in this winter's World Championships, but this time the biggest threat is not the arch-enemy Norway but an invisible virus with the power to crush all dreams.