Hank temporarily returns to The Hamptons to attend a ceremony for Divya and her new baby, and helps a musician who may have a grave illness. Meanwhile, a mysterious young woman has also crashed the party.

The Lawsons discover that they have a sister, but something is off about her. Meanwhile, Hank helps out a tennis pro, and Jeremiah copes with life with Divya and her baby.

Boris sends Hank on a dangerous mission in Monte Carlo, Emma's presence puts stress on Evan and Paige's marriage, and Divya and Jeremiah try to solve a mystery illness for a team of firefighters.

Evan's effort at a publicity stunt backfires, a new patient may be a mobster, Paige's career may be in jeopardy, and new hospital management may be trying to run HankMed out of business.

Hank talks to Emma about her future, while a restaurant's new chef exhibits unusual behavior. Divya treats a NASCAR crew chief who is having anxiety issues.

Jeremiah becomes interested in the roommate of one of his patients. Emma feeds gossip to an online site. Hank and Divya treat a house-sitter.

An old flame visits Hank while seeking medical advice, Divya bonds with a patient trying to get pregnant, Emma is invited to an upscale birthday party, Jeremiah has a date with Viviana, and Paige wants to confront Russell about the rug.

The team sees two new clients as Hank Lab opens, Cinco hurts Emma's feelings, Evan discovers that he is an "old fart," Hank helps Charlotte get ready for her procedure, and Divya unnecessarily meddles in Jeremiah's relationship.

Divya and Sachi go with Hank and Boris to Argentina to visit Sachi's grandmother. Evan is angry over a compromising photo of Hank. Jeremiah tries to patch things up with Viviana. Paige helps Ray decorate and helps Russell make amends.

Evan tries to distance HankMed from Ray while dealing with Emma's role in impugning Hank. Divya must find a way to return Sashi home and work with Jeremiah as they treat a model in frail health.

Evan and Paige help Emma go after Oz while Hank is left to treat Cinco. Divya and Jeremiah treat a boat builder, and Charlotte acclimates herself to life after surgery.

Hank and Evan search for Emma, while Divya must fight to keep Sashi. Paige discovers shocking news about her therapist, Jeremiah decides to make a few changes, and Boris has new concerns about his condition.