Achieving effective sex offender treatment can be aided by following pre-existing successful treatment techniques while acknowledging that therapy must be adapted according to an individual's unique presenting difficulties and therapeutic needs. Mr. X was a middle-aged married man with two children. He was brought to the attention of the mental health services following a conviction of indecent assault against a male minor. He had been charged with a similar offense some years before. His assessment consisted of 7 hours of interviews and the administration of numerous psychometric tests. The treatment plan was based on a cognitive-behavioral theoretical approach. Mr. X was involved in both individual and group therapy. Resistance after 10 sessions of individual therapy led to a decision to stop the therapy for a 3-week period. The treatment subsequently resumed. The treatment indicated that Mr. X's cognitive distortions were challenged with some success. However, any successful outcome would need to be considered longitudinally. It is hoped that Mr. X will continue to attend the support group voluntarily to discuss any concerns that may occur and to enable the therapist to evaluate whether the gains are maintained. Figure and 8 references (Author abstract modified)