Sam faces her hardest challenge yet: avoiding alcohol on St. Patrick's Day in Boston. Brit gives Sam an unexpected chance to rekindle their friendship. James and Mindy track down his lost keys while battling St. Patrick's Day temptations.

Sam's newfound self-confidence is shaken when she learns her new boss is a blast from the past. Meanwhile, Felicia errs in how to congratulate her boyfriend on his promotion. And Olivia makes a life-changing decision.

At Olivia’s baby shower, Sam is forced to accept that she needs a new sponsor, but doesn’t hit it off with Olivia’s suggestion. Carol visits Felicia and the two discover they have more in common than they thought.

Sam struggles with whether or not to come clean to Alex about recent events. Meanwhile, James finds strength in his community, and Bob fights for Carol.

Sam continues her search for her higher power. Brit and Joel throw a divorce party. Felicia considers next steps in her relationship with Peter.