There are 3 books in the Hester Thursby Mysteries series. The newest book is Watch Her which came out in 2020.

1
Little Comfort

Book cover of Little Comfort
In a brilliantly twisted debut set among Boston’s elite, Edwin Hill introduces unforgettable sleuth Hester Thursby—and a missing persons case that uncovers a trail of vicious murder . . .
 
Harvard librarian Hester Thursby knows that even in the digital age, people still need help finding things. Using her research…
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2
The Missing Ones

Book cover of The Missing Ones
“This whodunit has broken family dynamics and a wonderfully complex and intricate mystery, plenty to engage readers looking for a new amateur detective to follow.” 
—Library Journal STARRED REVIEW
 
“Intense…Hill is adept at building compassion for his characters in a tight-knit social web while implicating them in dark thoughts and…

3
Watch Her

Book cover of Watch Her
In the third intelligently dark suspense novel by two-time Agatha Award-nominated author Edwin Hill, Harvard librarian Hester Thursby becomes enmeshed with a powerful Boston family desperate to keep their deepest secrets from coming to light...

"Complex...a masterly mystery." --Kirkus Reviews

Fans of Ruth Ware and B.A. Paris won't want to…