Eva (Eugénie Derouand, Paris Police 1900), an ex-dancer, is now using a wheelchair, unable to walk. When her friend Sophie (Honorine Magnier, Tomorrow is Ours) gives her an old wooden antique advent calendar before Christmas, she realises each window contains a surprise that triggers repercussions in real life. Some of them are good, but most of them are bad, really bad. Now Eva will have to choose between getting rid of the calendar or walking again – even if it causes death and destruction to everyone she holds dear around her.