Bellrock Cove Is A Busy Seaside Resort At The Mouth Of The River Shannon. Its Also Home To An Elite Coastguard Special Operations Unit. Primarily Their Job Is Search And Rescue But A Busy Waterway Brings Many Challenges And Smuggling Is One That Regularly Puts Their Detection Skills To The Test. Prior To A Major Boating Event A Quantity Of Heroin Is Found At A Quiet Beach North Of The Town Which Leads To A Series Of Shootouts And Chases On Both Land And Sea. A Farmer Is Also Found Dead Under Suspicious Circumstances. Could There Be A Connection? Just To Complicate Things Further And Heap More Pressure On The Now Overstretched Unit A Light Aircraft Sends Out A May-Day Call As The Boating Event Is Underway.