Logan Mountstuart is a fictional character from the novel "The Book of Fame" by Alasdair Gray. He is depicted as a complex individual whose life spans several decades, reflecting the social and political changes in Scotland during the 20th century. Throughout the narrative, Logan's experiences and relationships shape his identity, illustrating themes of love, loss, and the search for meaning. His character serves as a lens through which readers can explore the intricacies of human nature and the impact of historical events on personal lives.