In Too Deep by Sherrie Lynn

Former co-workers with a shared history of sidestepping emotional entanglements, their cruise vacation was meant for tying up loose ends. Little did they know, the tempest that awaited them would force a reckoning with their untold desires. As a ferocious storm rages, these two enigmatic ‘Agents’ find themselves thrust into a maelstrom of unpredictability. The very fabric of their training as international spies is tested as they grapple with unforeseen challenges. Can love, potent and undeniable, be their saving grace?