Tess feels conflicted about Sam and Trevor, and seeks Henry's advice. Summer avoids the past, while Deonte obsesses over his new crush. Ronnie and Marissa's friendship grows, the Mystery Giver brings even more cheer, and Trevor drops big news on Sam.

Trevor asks for Sam's help picking an engagement ring. Sam botches being honest with Tess. Ronnie admits he has feelings for Marissa, and Deonte fears his love is lost. Harry helps Summer reconcile with her sister. The Mystery Giver is identified.

Tess learns Sam is moving to New York and has second thoughts about Trevor. Ronnie stages an epic battle to show Marissa his true feelings. The friends celebrate Christmas Eve Eve together, City Denim is saved, and the true Mystery Giver is revealed.