Mallory books by Carol O'Connell (Books 2, 4-6, 8-9)

The Man Who Lied To Women/The Man Who Cast Two Shadows (book 2)
Formerly a child of the streets, now a brilliant computer hacker and NYPD sergeant, Kathleen Mallory's powerful intelligence is matched only by the ferocity with which she pursues her own unpredictable vision of right and wrong. And she will need every bit of that intensity now, in a murder case that strikes close to home in more ways than one.

Flight of the Stone Angel (book 4)
NYPD Detective Kathleen Mallory is back--to face her most terrifying obsession--the murder of her own mother...

Shell Game (book 5)
When a legendary magic trick goes horribly awry on national TV, detective Kathleen Mallory knows the gruesome death won't be the last. For misdirection is the heart of all magic-and perfect crimes.

Crime School (book 6)
Police Detective Kathleen Mallory recognized the dead call girl. It was someone from her past, a woman who protected her on the streets of New York—and who betrayed her. Mallory also recognized the crime scene: victim hanging, hair in mouth, fire burning. It happened twenty-one years ago, when Mallory was a child. Now—whether it’s the work of a copy-cat killer or a serial murderer—it has happened again.

Kathleen Mallory’s past has finally caught up with her.

Winter House (book 8 )
A reclusive senior citizen kills an intruder—but there's more to the story. In Carol O'Connell's new novel New York City officer Kathleen Mallory purges a woman of her mysterious past—and the flesh-and-blood ghosts of a violent family legacy.

Find Me (book 9)
On Route 66, as word travels that children's grave sites are being discovered along the road, the parents of missing children form a silent caravan. They are being shepherded by NYPD Detective Kathleen Mallory, who seeks a killer like none she has ever known-and a child unlike the others: herself.