When Penny Dahl calls the Find and Save detective agency hoping for help finding her missing daughter, Holly doesn't want to take on the case. With her partner Pete having Covid and her mother having just died, Holly needs a holiday more than ever. But something in Penny Dahl's desperate voice doesn't allow Holly to refuse her. A few blocks from where Bonnie Dahl disappeared, professors Rodney and Emily Harris live. They are the epitome of bourgeois respectability: married octogenarians, devoted retirees who have spent their entire lives engaged in science. But they're hiding a dirty secret in their well-kept, book-lined home, and it may have something to do with Bonnie's disappearance. It's almost impossible to figure out what the Harrises are up to: they're smart, patient, and ruthless. Holly must use all her talents to outsmart this devious pair of professors.