Introducing the three unlikeliest sleuths you'll ever meet ...

Every Thursday, three retired school teachers have their 'coffee o'clock' sessions at the Thirsk Garden Centre caf. But one fateful week, as they are catching up with a slice of cake, they bump into their ex-colleague, Topsy.

By the next Thursday, Topsy's dead. The last thing Liz, Thelma, and Pat imagined was that they would become involved in a murder. But they know there's more to Topsy's death than meets the eye - and it's down to them to prove it ...