When Gina and Robert de Valicourt met 300 years ago, even Gina's suitors MacLeod and Fitzcairn had to admit they were destined for each other. Each century, as Robert and Gina renewed their wedding vows before their friends and fellow Immortals, their love grew stronger. But now their marriage is on the rocks. MacLeod decides it's up to him to reunite the once happy couple, and he enlists a very unwilling accomplice in his cunning plan.

Are MacLeod and the police seeing a ghost when the evidence in a diamond theft and poison gas murder points to the very evil, but very dead, Xavier St. Cloud? CID Agent Renee Delaney returns to ask for MacLeod's help in finding the killer. Could it be Xavier or simply a memorial to a fallen teacher by Xavier's former student, Morgan D'Estaing?