Human remains are recovered from the bottom of the River Clyde. Not an unusual occurrence, but these have been sleeping the deep, dark sleep for eighteen years. Suddenly Glasgow's underworld is buzzing with the news that the dredged up bones belong to Gentleman Joe Strachan, Glasgow's most successful and ruthless armed robber.
When Isa and Violet, Strachan's daughters, hire Lennox to find out who has been sending them large sums of cash each year, on the anniversary of Strachan's most successful robbery, his instincts tell him that this job spells trouble and will take him back into the dark world of the Three Kings - the crime bosses who run the city.
He takes the job nevertheless. And soon learns that ignoring his instincts might just cost him his life.
This is the third fantastic thriller featuring shady investigator Lennox as he stalks Glasgow's tough streets. The Deep Dark Sleep is gritty, fast-paced, and totally absorbing.