Fatal Decision: The Freeman Files Series – Book 1 by Ted Tayler

Gus Freeman is a retired Detective Inspector who has spent the past three years alone.
Freeman’s wife, Tess, died from a brain aneurysm six months to the day after his retirement.
He is still coming to terms with his enforced solitary existence.
His old boss wants Gus to head up a Crime Review Team investigating cold cases.
Gus can’t resist the chance to enter the fray for one last hurrah.
“It’s a mystery that will keep you wondering, with the usual wide array of characters to enjoy that give Tayler’s novels their stamp.”