During a pandemic, the advice issued by public health authorities undergoes significant scrutiny, potentially affecting public adherence to recommended measures. Trust and trustworthiness become key. This book analyses the rhetorical strategies of the Norwegian public health authorities as the COVID-19 pandemic moved through phases that presented different rhetorical problems and challenges. Many consider the Norwegian response successful, making it a particularly interesting case. Adopting an organisation-focused viewpoint, the analysis examines communication strategies through a dataset collected as the pandemic evolved. This included observations within communication departments of the main public health agencies during March and April 2020. The study offers five key insights: 1) A pandemic rhetorical situation has changing constraints and opportunities that influence the agency of the rhetor and necessitates bottom-up, continuing situational analysis and attention to perceptions; 2) The notion of “the rhetorical situation” conceptualises different phases that “bleed” into each other; 3) Trust and trustworthiness are negotiated through specific rhetorical strategies; 4) Transparency is the most crucial strategy; 5) Authorities used a combination of invitational rhetoric, providing a role for the citizens to willingly contribute to curbing the virus, and imperative form through simple directives that citizens were expected to follow.  The primary audience for this book is scholars and practitioners within crisis communication. The book is written by a team from the “Pandemic Rhetoric” project, financed by the Research Council of Norway, consisting of Øyvind Ihlen (University of Oslo), Sine Nørholm Just (Roskilde University), Jens E. Kjeldsen (University of Bergen), Ragnhild Mølster (University of Bergen), Truls Strand Offerdal (University of Oslo), Joel Rasmussen (Örebro University), and Eli Skogerbø (University of Oslo).