Popular Scottish drama Shetland to return in August with Douglas Henshall's final act

msn.com:

BBC One, with actor Douglas Henshall saying farewell to the Scottish programme. Acclaimed murder-mystery series Shetland returns for a new thrilling six-part tale, as DI Perez and the team investigate the mysterious disappearance of a vulnerable young man. READ MORE - Scottish contestants wanted for Gordon Ramsay's new ITV competition seriesOn return from suspension, DI Perez reunites with Tosh as they meet the owners of a local B&B, Rachel and Danny Cairns, who are frantic with worry over the sudden disappearance of their son, Connor.

New to Shetland, the family moved from Glasgow after Connor suffered a breakdown. Rachel worries that history has repeated itself, but Perez suspects they are hiding something.

Perez, Tosh and Sandy find that Connor was well known and much loved, with many worried about his whereabouts. Interviews with his sister, Abbie, and his girlfriend, Bryd, highlight Connor's fraught relationship with his father, which sometimes saw him escape to his ‘safe place’.

The case takes a dramatic turn when Tosh discovers Danny Cairns’ past life and the reasons behind their sudden relocation to Shetland.