She is the author of World Enough, a psychological suspense thriller set in the Boston music scene, and the Blackie and Care, Theda Krakow, Dulcie Schwartz, Pru Marlowe, and Witch Cats of Cambridge cozy feline mysteries.
Her non-fiction books include Madhouse: Growing Up in the Shadow of Mentally Ill Siblings, Fatherless Daughters and Feline Mystique: On the Mysterious Connection between Women and Cats.
Her 1997 memoir, Mad House: Growing Up in the Shadows of Mentally Ill Siblings, was an outgrowth of a well received article on the subject she wrote for the Globe's Sunday magazine.
An examination of the relationship between women and cats, and how they have interacted in mythology, science and literature, Kirkus wrote that it was "Wide-ranging and perfectly pitched: both sensitive and sensible.
During a conversation about The Feline Mystique, Kate Mattes, the store's owner, told Simon that there was a "huge overlap between women who love cats and mystery readers."
[13] Released in 2005, Publishers Weekly wrote that it was an "auspicious fiction debut with a well-plotted cat mystery that's not your usual four-footed cozy caper.
[17] The Boston Globe said, "In electric prose, Simon conjures the rock-and-roll world, its drink, drugs, and band-dynamics, and the twin seductresses of excess and success, as she makes a penetrating portrait of friendship.