It's Valentine's Day and most women would be thrilled to receive a card from a secret admirer. Not so, ninety-year-old Essie Cobb, one of the star residents of the Happy Haven Assisted Living Facility. When Essie finds an over-the-top, flowery, valentine from an unknown individual in her mailbox, she goes into detective mode. Who could this person be? Why would they send her such a card? Essie is determined to find out, even if she has to ask for help from her three friends––Opal, Marjorie, and Fay. When Essie's snooping takes a dangerous turn, she finds herself thrust into the middle of a police investigation. Will Essie help the police solve this Valentine's Day mystery or will she strike out on her own against an unknown foe who has anything but romance in mind?