B.E.A.S.T.: Biological Evolutionary Animal Simulation Test

s/t: Biological Evolutionary Animal Simulation Test
First American edition.
Charles Eric Maine (pseudonym of David McIlwain; 1/21/21-11/30/81) was an English sf writer whose works were mostly published in the '50s & '60s.
What Mark Harland finds at the secret biological research laboratory is much more basic and frightening than a minor breach of security. And what happens when B.E.A.S.T. becomes a beast, and breaks loose from its magnetic tape, is something which Harland has to handle on a cath-as-catch-can basis, until the whole thing explodes into violence and pervertion–-with Harland out on a very loose and long limb.