Lynn and Douglas are new in Greenwich. Life in Scotland was great, and now everything is different. Alexa is their new - and only - friend, and when her aunt suddenly disappears, they do everything they can to help find her…

Jenny, their mum and a detective, is trying to solve a crime. Someone, or some people, have stolen some diamonds - and she needs to find them. Greenwich is a big place to find little stones, but with the help of the internet and her children's friends and photos, she sets a trap to catch the thieves.