On a mission to crack the code in his twin’s notebook, John returns to the police station. A frustra...

A new case takes Ludwig on a walking tour of Cambridge, where he’s faced with an impossible question...

A body falls from the fourth storey of a construction site. Was it just a terrible accident, or a pe...

John and the gang go back to school to investigate the suspicious death of a headmaster. Lucy sneaks...

A cryptic late night call from Holly sees Lucy lured into danger. Back at the station, all eyes are ...