THE SEVEN DEADLY SISTERS by Pat McGerr STAIRCASE 4 by Helen Reilly Dell Books, 1st Paperback Printings, 1950 & 1951 Condition: Good+ Two vintage Dell mapback mystery novels by women, one an award- winning author, the other a former president of the Mystery Writers of America. Both books have spine leans, front cover corner creasing, spine edge wear, light page toning. SISTERS has a short spine end tear, but no writing. STAIRCASE has more significant lower spine end tears, small writing on front cover & title page. But both have secure bindings.