Collaborators is a comedy about marriage set in a dingy, infested flat in Belsize Park in the late 1950s. Henry Winter, a struggling young barrister, is also struggling to cultivate his writing career. At the invitation of Sam Brown, an American film producer of somewhat hazy credentials, he starts work on a film strip about marriage. His own tempestuous marriage invades the project and Sam becomes increasingly baffled by the attitude of Henry's wife, Katherine, whom he sums up early as a "ball cutter' and indeed of Henry himself. John Mortimer's play is a witty evocation of the period and of the private games of war and peace that epitomize certain periods in a marriage.