Sierra loses control after more conflict with Kate in the Season 4 finale. Also: Emily questions Ben's relationship with Kate; Ashley receives an attractive offer; Nico and Lauren chat; and Ben crosses a line, forever changing his friendship with Kate.
Kate loses her patience over Emily and Sierra's work ethic. Meanwhile, Sierra and Kelley clash when Sierra overhears a conversation, Kelley adapts to a new senior deckhand, plus Kate's behavior irks Lauren and Nico.
Kelley faces the consequences of stranding Dean on an island. Also: Capt. Lee makes a decision that shakes Kelley to the core; Ben and Emily kick up their relationship; and Kyle must decide whether to tell his girlfriend about his date with Sierra.
Capt. Lee scolds the crew for damaging a pricey piece of the boat. Meanwhile, long-term issues plague Nico and Kelley, and charter guest Dean Slover returns for a third trip and tests both Ben's culinary methods and Kelly's managerial skills.
Kyle tests Sierra's patience. Meanwhile, Ben's galley work has a near lethal impact on one staffer; Kyle connects with a charter guest and shows a new side of himself; and Ben and Emily's relationship rises to the next level.
The guests are psychics and their famed friends. Meanwhile, Ben and Kate clash over more miscommunication; Ben embarrasses Emily; Kelley's management skills fail to impress Nico; and a windstorm hits, jeopardizing the safety of the charter guests.
Kelley fumes when he discovers how Sierra treated a deck-team member. Meanwhile, Emily delights in a night out with Ben, and drama heats up between Kate and the exterior crew. Also, Kyle delivers the charm when he goes out on a date with Sierra.
Kate bids adieu to her gal pal while Ben offers a heartfelt gesture to a fellow yachtie. Also, the crew must prepare the quintessential surprise engagement dinner for two guests; Kelley loses control of his deck team; and Kyle inches closer to Sierra.
Capt. Lee becomes frustrated with Kelley in the wake of a succession of missteps. Meanwhile, a guest rattles Ben's ego, and Kelley continues to woo Emily. Then, in a terrifying development, lives hang in the balance following a boating accident.
Sierra makes a choice following an edgy evening with Ben. Also, Kelley faces a shorthanded charter under the hard glare of Capt. Lee, a new crew member joins and is drawn to a stewardess, and Nico's romantic overtures could cost him a friendship.
Capt. Lee's wrath is directed at Trevor after the crew's safety is jeopardized during a night out. Meanwhile, a stressed Ben faces a charter guest with specific dietary needs; Kelley and Nico are both drawn to the same staffer; and Sierra discovers it can be difficult working with Ben.
Kelley makes a decision on how to proceed with Trevor. Meanwhile, charter dramas include a pampered poodle and a stressful beach clambake; Ben and Kate clash (again); and Trevor proves old habits die hard during a night out.
Five new yachties join veterans Capt. Lee, Kate, Ben and Kelley as they prepare the luxury vessel Valor for travel in the Season 4 opener. Charter guests include a social-media-consumed darling and her friends, and Kate tutors two junior stewardesses.