Allison & Busby

When Owen Sheen and DC Aoife McCusker receive a note from a retired PSNI cop who has gone missing, their search for him leads them down a dangerous road.

On cold, clear, moonlit night in late October, DCI Kelso Strang stepped outside the bothy on Suilven and heard, faint but unmistakable, the howl of a wolf. An unsettling sound - but it isnt the only unsettling thing about the remote township of Inverbeg in Sutherland, where hes taking a break with an old army friend.

When police sergeant Don Colyear is forced to move to a remote Highlands town, he doesnt expect a string of teenage disappearances and a murder.