Ken is hired by an environmental group to investigate water pollution, and finds that the pollution is not only dirty business going on. Meanwhile, Harry's plans to start a security business suffers a setback when his bank manager refuses him a loan.
Men's back in business with a new boat, new offices and a new name for the company because Harry and Ken are now in partnership,running Crawford Boon Security (CBS); Ken runs the investigations and Harry acts as a security consultant. Sadly the clients do not change.
An Irish builder asks Ken to investigate a break- in and theft of cash at the office, while women spell trouble for the two friends when Ken goes to investigate a burglary and Harry moves house and Rocky lodges with him.
Ken takes a job minding a tough Glaswegian footballer who finds it hard to keep his eyes on the ball; Harry is kept busy by a contract to guard some puppies, and a request to organise the pub's football team for this match with a team from a nearby prison with Rocky keeping goal.
Ken and Harry are shocked when they delve into the affairs of a local landlord and discover that he is trying to evict good tenants. And Laura and Rocky decide to teach a schoolteacher bully a lesson he won't forget.
Ken finds himself being interrogated about a crime he did not commit, thanks to a jilted lover and a lying husband. Harry is approached by an elderly man who wants to rent space in the warehouse - a request that is not quite as innocent as it sounds.
Laura and Rocky are asked to tail a man recently released from prison, and the owner of a motorbike shop enlists Ken's help in recovering a bike sold to a customer who provided a bogus name and bank details.
Wedding bells are ringing - but the nearest Ken and Harry get to the festivities is installing security cameras for the big day. They observe both family members and guests behaving suspiciously, and soon find themselves witness to nefarious activities.
Ken is in for a few surprises when he investigates a woman whose husband suspects her of adultery, while a chirpy Liverpudian teenager asks him to trace the father she's never known. Harry, meanwhile decides to organise a Christmas party then worries that nobody will turn up.