Kat assumes Alfie's behaviour is down to the anniversary of Nana Moon's death (memba her?), unaware he is plagued by thoughts of her infidelity. However, in an attempt to push his doubts aside he pulls out all the stops to turn the Square into a festive extravaganza. Again. Derek becomes the fall guy for Max as he helps his brother protect his secret, Bianca takes out her financial frustrations on Lola, and Zainab is shocked by the arrival of an unexpected guest.