Plot summary
Trouble stirs in the practice when the man who hit Maya and Dell shows up, only for them to find out that he has a heart condition. While Violet and Pete are having dinner with an old friend of Pete's, they discover that he has been operating on patients in his home. Pete tries to help him out, and this worries Violet. Addison worries about her friendship with Naomi, while Sam flashes back to a pedophile case in which he was involved during his internship. Naomi hires Amelia to work in the practice, and Sheldon suggests ways for Naomi to work through her anger towards Sam and Addison.
Cooper finds out that Charlotte has been looking for a house and when he asks why, she explains that it reminds her of everything bad that ever happened in their relationship. Pete turns in his friend when someone almost dies on the table, and he and Violet work on him working at the ER. Sam's revelation about the internship case he refused to discuss in detail for years exposes the core of his failed marriage to Naomi.
Credits
Adapted from Wikipedia contributors, Private Practice season 4. HTML formatting and reference markers removed.