Marker Hardcover – May 24, 2005 by Robin Cook 
Book 5 of 12: Jack Stapleton & Laurie Montgomery
 
Investigating a series of bizarre deaths that have taken place among seemingly healthy young people after routine surgeries, doctors Montgomery and Stapleton confront institutional politics that hamper their ability to prove that the deaths were intentional, a situation complicated when Montgomery discovers that she carries a genetic marker for breast cancer and requires surgery herself.
 
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