After completing his national service, Book returned his bricklaying job in Bath and started playing for Frome Town. During the 1955–56 season Frome suffered financial difficulties, and sent letters to all their players permitting them to leave if they wished. Book showed his letter to a colleague, who played for Bath City of the Southern League. He in turn informed the Bath chairman, and Book signed for the club in January 1956. He spent seven and a half years at Bath, becoming captain in the latter part of his Bath career, and winning the Southern League title in 1960. In the 1962 close season, Malcolm Allison became Bath manager, beginning a long association between the two.