Encouraged by his daughter to try something new, widower Charles Nieuwendyk answers an ad from a private eye seeking a mole at a retirement community.

Charles has some explaining to do when Emily unexpectedly arrives in town — and another missing item lands him in Elliott's cranky crosshairs.

While Julie uses a lavish gift as bait, Charles tries to connect with Gladys. Virginia encourages Florence to splurge on something she's always wanted.

On a tour of San Francisco's historic sites, Charles and Calbert bond while talking about the past, present and future. Didi and Julie lock horns.