The two families go on a Caribbean holiday paid for by one of Caroline's grateful clients but Charlie feels out of things as all the other members of the group find romantic attachments and Caroline shocks him by going skinny-dipping with hunks and then performing a raunchy karaoke. When he injures himself she comes running but when he ponders his future both he and Caroline,whilst admitting their mutual fondness,wonder if marriage is the right option. (thetvdb.com)