By Laurie Rockenbeck Rachel Howzell Hall’s newest offering, And Now She’s Gone, introduces us to newbie private investigator Grayson Sykes. With her wrinkled clothes and easy distractibility, Gray comes across as a latter-day Colombo. She forgets to record interviews, can’t remember to take antibiotics on time, and finding a working pen is beyond her.  In spite of all her fumbling and absent-mindedness, Gray is able to follow individual clues and piece things together in her own, unique way­. To prove Isabel Lincoln is alive and well, her boyfriend, Ian, has hired the investigation firm Gray works for to find her.…