Spain, 1639. When Len de Montemayor's family is killed, she thinks her life is over ... until an aristocratic family rescues her. Len finds a soul mate in their son, Piers, and as they grow up together, their friendship becomes a love so intense that it comes with a promise: it will last forever. But with the outbreak of civil war, a dutiful Piers knows his fate is with the Royal Navy, leaving Len waving from the shore as he sails toward an uncertain future.