Selective Memory by Jennifer L. Jordan

A Kristin Ashe Mystery

When a classical pianist experiences profound memory loss after a near-fatal accident, she hires private investigator Kristin Ashe to recreate the days and months leading up to the crash.

Unable to trust the perceptions of her partner, friends or family, Alexandra Madigen relies on Kristin to help her reclaim her identity. As Alexandra's memories return in fits and flashes, not all of which she shares with Kristin, they reveal a twenty-year obsession with another woman.
Fran Green, a feisty ex-nun turned detective, assists Kristin in unraveling the whirl of selective memory.'