TREASURE BY POST

This time out, merchant banker Mark Treasure (Prescription for Murder, p. 218, etc.) and his lively actress wife, Molly, are visiting Chiversley, where she is appearing in a film and where he has been asked by a bishop friend to become one of the three ``Convent beneficiaries'' of the Society of Blessed Mary Magdalene at Saint Timothy's Church to find a replacement for the murdered church organist. Should he vote to close the convent, which is down to its last three, exceedingly geriatric, nuns? Another convent beneficiary is murdered; arson claims the life of a nun, who, unknowingly, was creating stamp forgeries in the convent print shop; and the Utteridge Brewery fortune, which funds the convent, has several disagreeing claimants, each with plans of their own for spending the money, some noble, some in pursuit of the canon's man- trap niece Christine, a former model now scarred from a car mishap. With a painstaking look around, Treasure vanquishes an ironclad alibi and ties the forgeries to the murders and to the fate of the convent. The nuns are endearing, but the alibi that depends on an identity switch is pretty stock stuff. Still, there's enough of interest here to charm puzzle fans.