CHILLS AND CHUCKLES . . . This selection of mystery tales by Ann Morven, diva of the whodunit, varies from the macabre to the magical, yet always a gripping read. Whether it is widowed Marjorie cultivating weeds, Luckless Liz trying to strike it rich or balladeer Sheil B. Wright bumbling along a murder trail, readers are assured of sizzling entertainment.