Fifteen-year-old Jess, living with her mum, separated from her father in Cornwall, and with a best friend who seems to do everything perfectly, finds her own assets through humor.
Intrepid canine detective Chet accompanies his human police officer partner, Bernie, on a first assignment involving the disappearance of a teenage girl who ran with the wrong crowd, a case that is complicated by Bernie's dysfunctional personal life.
Jess knows her summer plans are ruined but little could she imagine the huge surprise that awaits her when she visits her dad's home for the first time in years.