Named after the Argentine Trotskyist J. Posadas, the movement's journey through the fractious and sectarian world of mid-20th century revolutionary socialism was unique. Although at times significant, Posadas' movement was ultimately a failure. As it disintegrated, it increasingly grew to resemble a bizarre cult, detached from the working class it sought to liberate. The renewed interest in Posadism today - especially for its more outlandish fixations - speaks to both a cynicism towards the past and nostalgia for the earnest belief that a better world is possible.

Drawing on considerable archival research, and numerous interviews with ex- and current Posadists, I Want to Believe tells the fascinating story of this most unusual socialist movement and considers why it continues to capture the imaginations of leftists today.