When an old friend and romantic interest of Shirley's, Richard Lawrence, comes to town, he brings his 11-year old daughter, Julie. Julie is a Partridge fan, and everyone teases Keith that Julie will be groveling at his feet during the visit. When the Lawrences arrive, however, it seems that Julie's affections are not lavished on Keith, but on Danny! Julie spends all her time following Danny, while Danny spends all his time trying to hide from her. When Shirley tries to tell Richard that Julie is a bit too aggressive and Danny is not ready for this, Richard reacts like a wounded father. Laurie and Keith ask Danny to be nice to Julie for just a few days, in order not to ruin Shirley and Richard's relationship. Danny reluctantly agrees, and when he tries it, he finds he really does like Julie. When he gives in to a sudden urge to kiss her, she reacts by giving him a black eye! This doesn't make any sense at all to Danny, so he goes to the older folks for an explanation. When Keith and Laurie try to give him advice, they end up arguing with each other, so Danny goes to Shirley and Richard. They tell him they honestly can't explain it, but since it's between Danny and Julie, he should try talking to her. Julie and Danny go to the ice cream parlor for a chat. They end up the best of friends and promise to write to each other when Julie leaves.