A Bucks' night prank goes horribly wrong for the Groom and Sterlo - his best man. Paula agrees to Michael having informal access to their son, Max. But Michael begins to subtly use the situation to turn the screws on Luke and Paula's relationship, whilst endearing himself to Max. While everyone thinks Sophia is Charlotte's estranged lover their real relationship is much closer. When a medical emergency throws everyone together - their personal and working relationship is put to the ultimate test.