It's Masquerade Ball time in Chelsea and there are a few surprises when Spencer decides to try a different approach to win the affections of childhood sweetheart Caggie. Meanwhile, Rosie is furious that Hugo has moved on so quickly with Millie after she turned him down. The ball also brings together exes Ollie and Gabriella, and what starts as their building a friendship ends in disaster when Gabriella sees him flirting with someone else.