The Pit: A Group Encounter Defiled is a non-fiction book on Mind Dynamics, Leadership Dynamics, and Holiday Magic, written by Gene Church and Conrad D. Carnes. The book was published Outerbridge & Lazard, Inc., in 1972, and was republished in a paperback edition in 1973, by Pocket Books. The book was later the basis for the 1983 film, Circle of Power.