O'Neil's newest romantic adventure of his dynamic young team of Donny Weston and Abby Marshall, now fully accredited agents of British Intelligence and barristers-in-training, who, on their way to park their beloved boat Swallow in Malta to be ready for the summer, encounter the schooner Speedwell at La Rochelle, where problems arise for Commander Will and his wife Mary Pleasance. Discovering, to their surprise, a serious romantic attraction, Tom Hardy and Lotte Compton also from the Speedwell join forces with Donny and Abby to oppose the threats to the Commander. From Valetta the four follow up the threat, only to find themselves faced with a plot to use a famous mercenary in an assassination that will rock the foundations of the Euro community, and the western world. Backed by Russia, a rogue CIA operative has set things up for a public shooting at a Euro summit. The four foil the plot and the assassination fails, but the CIA agent, is credited with foiling the coup and promoted. He wants revenge, and comes after the four. The outcome is decided in a action-packed shoot-out in high speed boats in the cold waters of the Thames estuary.