Series 4

As air-sea rescue searches for Charles and Avril, Sir Edward waits on Jan's answer to his proposal and Ken Masters looks to cash in on the plummeting Frere Holdings share price.

Jan comes under pressure after a break-in at her design house, Sir Edward involves Tom in plans for the America's Cup and Polly sets her sights on becoming a top business woman. 

Avril has discharged herself from the clinic, Jan offers Tom her shares in the Mermaid, Leo races for Relton and Abby does a photoshoot. 

Sir Edward and Ken discover their proposed oil site is a designated bird sanctuary, Sarah scuppers a Russian Leisure Cruise deal and could Jack be leaving the Mermaid Yard? 

Jan is befriended by fashion executive John Soames, Avril discusses her marriage proposal with her father and a big win at the races funds Jack’s plans for a wooden weekender vessel. 

Sir Edward provides Tom with some unwanted information about his America's Cup rivals, Ken and Sarah's business relationship becomes more acrimonious and Jack collapses on board the Barracuda. 

A race against time to save Jack's life, counterfeit dresses of Jan’s stolen designs turn up in Guernsey and an embittered Ken is backed into a corner. 

Abby’s custody battle receives a boost, Polly has plans to go into business and just who will Leo be racing for in the world championships? 

Emma takes the Orkadian for a trial run, Abby is desperate for her photographic exhibition to find critical success and Tom and Emma accept an appealing business proposition from Charles. 

Mike uncovers some secrets from Sir John Steven's past. Robert Hudson’s imminent arrival puts pressure on Abby and Jan and Jack and Emma organise the Tarrant Treasure Hunt. 

Robert Hudson arrives in Tarrant to discuss custody of William, Jack and Tom fall out over the future of the Mermaid Yard and Ken continues on his mission to expose Sir John Stevens in the press. 

Polly discovers Gerald has been cashing cheques from their account and they are virtually bankrupt, Charles and Avril meet head on and Abby returns home, putting the custody of William at risk. 

A mystery buyer is scooping up Relton Marine shares, the Fraud Squad visit Tarrant and Leo goes head-to-head against Ken in the powerboat championship.