The Madonna is a novelette written by Clive Barker. It was first published in the 1985 collection Books of Blood, Volume V.
Plot[]
A man named Jerry is trying to talk a local shady businessman into financing the redevelopment of an old swimming pool complex. However, the pool has some mysterious inhabitants in the form of nude teenage girls who flee should Jerry or his would-be financial backer encounter them. A swimming pool in the center is unlike the other pools in the building, in that it is full, glows with a strange light, and appears to be inhabited by some misshapen life-form. Curiosity leads Jerry to return to the place, which somehow causes him to wake up one morning to see that he has been transformed into a woman.