The Damage Done by Hilary Davidson
This is the first book in a series featuring travel writer Lily Moore. Lily has returned to New York City from her more recent life in Spain after the police contact her to tell her that her younger sister Claudia has been found dead in her apartment on the anniversary of their mother's suicide. The apartment is actually Lily's and she'd tried living there with Claudia, but couldn't handle her sister's personality on a daily basis. Lily goes to the apartment and notices things that seem strange and out of character for her sister. When she goes to the morgue to identify her sister, things get even stranger, as the body there is someone Lily has never seen before.
As she tries to find her sister, tracking down who and when anyone last saw or heard from here, she finds the police seem likely to think Claudia may have something to do with this woman's death. Claudia's best friend Jesse has her back, and provides a place for her to stay when she feels unsafe in her old apartment.
With her ex-fiance, wealthy hotelier Martin trying to come back into her life, Lily finds herself still charmed by him, and yet wary too. There are a few other interesting characters, from Claudia's ex, Tariq, to the strangely friendly new neighbour Sarah, to the two police officers, Renfrew and Bruxton, assigned to the case.
I liked Lily, and enjoyed seeing both her strengths and flaws become apparent over the course of the novel, and found the plot gripping, with a few twists thrown in.
I'd read the other two in this series a few years ago, so it was interesting to see earlier events in Lily's life, and I would have liked to see more of some characters, like Bruxton and Tariq, in the other books.