Spike & Dru - Christopher Golden

It is 1940 and Europe is ravaged by World War II - an ideal environment for two gleefully destructive monsters. Drusilla's birthday - that is, the anniversary of her resurrection as a vampire - is coming up and her devoted paramour Spike wants to celebrate in style. What more perfect a gift than the legendary necklace known as Freyja's Strand - a chain of metal so potently magical that it instantly imbues its wearer with the ability to shape-shift at will? The problem is, no one's sure that the bauble even exists. Until Spike learns of a demon named Skrymir, who claims not only to possess the necklace, but is willing to trade. Skrymir's true desire is to be rid of the most persistent thorns in his side, the Watchers' Council and the Slayer, so that he can implement his vision of world domination. Spike's task is to infiltrate Council headquarters and get his hands on the list of all the young women currently in training to take over as Slayer should they be called. In exchange for the necklace Spike must kill the current Slayer, a brazen young woman named Sophie, as well as all of the Slayers-in-Waiting - the 'pretty maids all in a row'.
Sophie and her Watcher, Yanna, are determined to stop whoever has been slaughtering all of the potential Slayers. If Spike and Drusilla succeed with their plans of bloodlust and power, it could mean the end of the Chosen One - all of the Chosen Ones - forever...
CAUTION -- THIS BOOK SHOULD NOT BE PLACED IN THE CHILDREN'S SECTION