Millie Partridge desperately needs a party. So, when her ex-colleague Nick invites her to a Hebridean Island for New Year's Eve, she books her ticket North. But things go wrong the moment the ferry drops her off. The stately home is more down at heel than Downton Abbey. Nick hasn't arrived yet. And the other revellers? Politely, they aren't exactly who she would have pictured Nick would be friends with. Worse still, an old acquaintance from Millie's past has been invited, too. Penny Maybury. Somebody Millie would rather have forgotten about. Waking up on New Year's Eve, Penny is missing. A tragic accident? Or something more sinister? With a storm washing in from the Atlantic, nobody will be able reach the group before they find out.