Esmie knows she wants to be a detective when she grows up – just like her dad. And now is the perfect time to start honing her investigative skills. First of all there's the mystery of Esmie's brother's girlfriend's mum (interestingly complicated!), who disappeared many years ago. Could she still be alive? Or could the body that turns up on the allotments be significant? Even more importantly, Esmie is worried that her dad still hasn't proposed to his girlfriend, Lizzie. After all, Esmie went to enough trouble to act as match-maker for them! Then Esmie discovers that something very strange is going on – Lizzie is having secret rendezvous with a mysterious man when she is supposed to be at work. What on earth is Lizzie's secret – and can Esmie find a way to make sure her new 'mum' and dad stay together forever?