Barney begs Ted to continue seeing his much younger, much wilder girlfriend, even though Ted has nothing in common with her. Meanwhile, Robin must adjust to the power of the bling.
Caroline and Max take side jobs as baristas in order to learn how to use the cappuccino maker they bought for their cupcake business.
Charlotte faces painful memories of a horrible tragedy; Amelia continues to spin out of control; Addison takes a step closer to motherhood.
Magnum and TC go under cover as efficiency experts when a corporate manager is murdered and everyone in the office is a suspect. Rick is curious why Higgins faked an injury to prevent her from investigating the case with Thomas.