This case study was based on original research aimed at finding out the effects of social skills therapy on manifestations of delinquency among Upper Basic Education Children in Calabar, Nigeria. The study adopted a quasi-experimental pretest posttest, nonrandomized design. The intervention, which had 16 sessions, lasted for 8 weeks. This period was considered enough to observe a behavior change in the intervention group, which is the experimental group. Qualitative and quantitative data was collected using a valid and reliable data collection tool. Quantitative data was collected using the researcher's constructed self-report instrument titled "Behavior Profile Questionnaire," which elicited information on demographic data and on delinquent manifestation among the participants in the study. Qualitative data was collected through observations using logbooks, interviews, and focus group discussions. A pretest was administered to participants in both the experimental and control groups. Those in the experimental group were exposed to social skills therapy consisting of lessons on communication, assertiveness, self-control, and empathy skills (CASE) therapy for an 8-week duration. Within the same duration, those participants in the control group received the routine counseling period on the school timetable. A posttest was administered to both groups after the 8-week treatment duration. Data analysis was done using both descriptive and inferential statistical analytical tools. The research questions were answered descriptively using mean and frequency, and further described using graphs. Inferential statistics (one-way analysis of variance, multiple analysis of covariance) was used to analyze quantitative data. The hypotheses were tested at 0.05 level of significance. The results of the study showed that the social skills therapy intervention significantly reduced the manifestation of delinquent behavior among Upper Basic Education children in Calabar, Nigeria. [This content is provided in the format of an e-book.]