From Amazon Brit Box:

Based on the best-selling Peter James novels, John Simm (Life on Mars) stars as Roy Grace, a tenacious yet troubled detective known for his unorthodox methods. As he walks a career tightrope, he is assigned to a missing person case.

From Amazon Brit Box you can stream 3 seasons of this British mystery thriller. Season 1 has 2 episodes. Seasons 2 and 3 have 3 episodes. Each episode lasts an hour and a half.

Throughout the series Roy Grace (John Simm) mourns the loss of his wife who  abandoned the family.  Evolving toward declaring his missing wife dead, he is slowly falling in love with the woman coroner Cleo.  In every episode Grace teams up with his sidekick DS Glenn Branson.

Each episode is well-written and involving.  Highly recommended.