The death of a scientist on the side of a live volcano proves a difficult case to crack for Humphrey and his team when everything appears to point to a death from natural causes.

Humphrey and Martha's romantic weekend retreat to a remote island is cut short when Charlie Taylor is found dead in his room at Hotel Cecile. Meanwhile, JP is worried that the honeymoon period between him and Rosie is coming to an end and seeks relationship advice from Dwayne.