No Diamonds for Christmas — Barbara Goodwin

Book 5 in the Love Beyond Time series. Beautiful restaurant owner Mary Benjamin time travels to the Queen Mary, circa 1956. When she arrives on the dark ship a masked man rescues her from nearly sliding overboard. At his tender touch an unexpected rush of desire courses through her, weakening her. But will he hurt her? Accomplished British jewel thief Gavin MacAfee will do anything to steal the cursed Resurrection Diamond from the Duke of Pemberton. Yet, everything changes for Gavin when he meets Mary under the brilliant stars on the Queen Mary's deck. A sudden rush of desire and a powerful need for her consume him. Mary doesn't trust Gavin when she meets him without the mask. He's too cocky, too sure of himself. Soon she finds she's falling in love with a masked thief who's tender and kind, yet obviously up to no good.