Retiree Lynley Cannon adores her Old Portland home with her clowder of rescue cats, but when elderly Fluffs drags in a dusky brown beach agate that turns out to be a priceless chocolate diamond, things change fast. The uncut stone, one of a pair called the Cats' Eyes, has been stolen from its wealthy owner, but how it ended up a cat toy, even the robbers cannot guess.

Threatened by kidnapping, theft, and murder, Lynley is determined to maintain her serenity, even if it means finding the crooks herself. With the police completely baffled, friends, family, and a hunky humane society investigator come onboard to help.

The killer thinks Lynley has the diamonds and will go to any lengths to get them back. Will Lynley live to clean the litter box another day?