Silos, Politics and Turf Wars tackles the organizational damage caused when departments protect their own priorities instead of working toward a shared goal. Through a fictional consulting story, Lencioni shows how a clear thematic goal can redirect energy away from internal competition and toward what matters most for the organization.
I have three Lencioni books on this list because they are quick, practical reads that work well with teams. They are accessible enough for busy leaders and give you language you can start using immediately. His reflection and discussion resources also make them useful for group development.
If you have ever watched good people work hard in opposite directions because each department is protecting its own corner, this one will feel familiar.