An 80-year-old man was stabbed in the neck with a barbecue skewer and left in a cupboard for up to three days.
Mr Ince is well respected and liked in the community
Leslie Ince, of St Ives Road, Walsall, was found on 21 February after his son flagged down a police car when he could not get into the house.
Det Ch Insp Matt Ward said Mr Ince had been in a poor condition since the attack with the 22in metal spike and remains critically ill in hospital.
Mr Ince's daughter said she would not rest until his attackers were found.
Two teenagers were seen outside the house and a green hatchback car was parked outside.
Neck and torso
Det Ch Insp Ward said: "This is an 80-year-old man who has had a 22in metal spike embedded into his body, through his neck and into his torso.
"He was dragged and left in a cupboard for two or three days."
Stephanie Collins, Mr Ince's daughter, has flown from Canada to be with her father.
She said: "This is almost psychopathic.
"To think there are people like this who are at large. We need to get them off the streets as soon as possible."