The Toy Boy Two — G.H. Bright

Pam takes a shine to her son's new flat mate, such a shine in fact, that she invites he round on a dare. Pete does not know Pam's husband is inside and that he is a very powerful man. He also does not realise the police are watching.
Things are going great but then Pam opens the door one morning and her world falls apart. There's been a hit and run and she's sure her husband is behind it. The problem is, the intended victim, Pete, is very much still alive and unhurt!