Tim Kennedy helped the gang solve the case involving the locker thief at school and Our Secret Gang has invited him to become a member. To qualify, Tim must help them figure out who's responsible for sabotaging a science department, and then he must reveal a secret. Tim Kennedy helped the gang solve the case involving the locker thief at school and Our Secret Gang has invited him to become a member. To qualify, Tim must help them figure out who's responsible for sabotaging a science department, and then he must reveal a secret.