Documentary following doctors and twins Chris and Xand van Tulleken as they experience the professional and personal implications of the Covid-19 pandemic. In the third week of lockdown in the UK, Chris finds himself returning to work on the wards for the first time in ten years. Chris gets to work treating patients on the infectious disease wards, and he quickly learns just how unpredictable the virus can be. Meanwhile back in March 2020, Xand contracts Covid-19, which leaves him tired and sluggish, and he also develops an irregular heartbeat, which he suspects is part of the aftermath of his infection