Jeremiah Fisher discovers a financial error at Adam’s firm in The Summer I Turned Pretty season 3.
The discovery occurs in episode 5, “Last Dance,” while Jeremiah is working late at his father Adam’s firm. He identifies a critical mistake involving a company the firm wants to acquire, giving him an opportunity to demonstrate that he is more capable than colleagues who dismiss him as a nepotism hire.
The professional storyline connects Jeremiah’s personal future with the wedding plot. Adam is impressed by the discovery and offers to pay for Belly and Jeremiah’s wedding if they hold it at his country club. However, the offer also contributes to Belly’s discomfort with the wedding becoming increasingly lavish.
This storyline is separate from Jeremiah’s later culinary ambitions. By the finale, he is moving toward a culinary career, while the firm episode focuses on his temporary business role and his attempt to earn professional respect.