Shrouded — Carol Anne Davis

Douglas likes women - quiet women; the kind he deals with at the mortuary where he works.
Douglas meets Marjorie, unemployed, gaining weight and losing confidence. She talks and laughs a lot to cover up her shyness, but what Douglas really needs is a lover who'll stay still - deadly still.
Driven by lust and fear, Douglas finds a way to make girls remain excitingly silent and inert. But then he is forced to blank out the details of their unplanned deaths.
Perhaps only Marjorie can fulfil his growing sexual hunger. If he could just get her into a state of limbo. Douglas studies his textbooks to find a way...