Detective Harriet Foster: Book 4
Publication Date: December 2, 2025
When a tainted drug starts claiming lives across the city, Detective Harriet Foster and her team race to track down the source…before it takes one of their own.
Chicago’s finest are scouring the city for a tainted new opioid making the rounds, but they’re coming up empty. With five people already dead—a college kid, a new mother, and three poker players—all they really know is the drug’s name: Edge. Where it’s coming from is still anyone’s guess.
Detective Harriet Foster doesn’t have time for guessing games. She needs answers. And when the next overdose hits Homicide where it hurts most, Harri is determined to get what she wants. But keeping her eyes squarely on the prize proves harder than expected.
Still reeling from her last case (and the stain of suspicion it left on her career), Harri finds herself at a tipping point. The drug isn’t the only edge she needs to worry about. If she can’t come back from her own, there’s no telling whether this investigation will lead to a satisfying conclusion…or her own demise.
Detective Harriet Foster stumbles onto a new case that hits close to home in Edge.
Author Tracy Clark uses the latest installment of the thriller series to highlight the seasoned investigator who is struggling in the fallout from the last case.
Even for readers just discovering Foster and her fellow detectives, the author provides sufficient background information. The latest case involves a new designer drug being peddled to Chicago residents with deadly results.
Tracking down the source of the drug opens the door to a complex investigation full of twists. It also highlights the emotional strain Harriet is under, which threatens her career. The author weaves in humor to make the characters more relatable.
Edge serves up a crime thriller pitting a team of racially diverse detectives against a culprit determined to stay at the top of the drug trade.
Tracy Clark is the author of the Cass Raines Chicago Mystery and Detective Harriet Foster series, award-winning books that feature tough, smart, Black female characters working the mean streets of the Windy City. Her debut novel, Broken Places, was CrimeReads’ Best New PI Book of 2018 and made Library Journal’s Best Crime Fiction list that same year. A finalist for Anthony, Lefty, Macavity, Edgar, and Shamus Awards, Tracy has won two G. P. Putnam’s Sons Sue Grafton Memorial Awards and one Sara Paretsky Award. She is a proud member of Crime Writers of Color, Mystery Writers of America, and Sisters in Crime and sits on boards at Bouchercon and the Midwest Mystery Conference. When not writing, Tracy watches old black-and-white movies, reads, or putters around. She roots equally for the Cubs, White Sox, Bears, Blackhawks, Sky, and Fire. As a proud Chicagoan, it’s deep-dish and hot dogs, no ketchup―vegan schmegan. And she can toss a (fictional) dead body anywhere and make it work. Dare her.
