Undercover Shift by Mia Taylor

“When your mate is involved, history doesn’t have to repeat itself…”
Heartbroken after a divorce which stunned and confused him, Rhett Lewis returned to his job as a Chicago PD detective, only to find himself in a situation he wasn’t expecting. His partner and best friend was gone and no one had the answers to satisfy his mounting suspicions.
Charlotte Pinkerton had been partners with Rhett for seven years, both bears from the same sleuth, coming up the ranks together. No one took it as hard as Charlotte when Rhett’s wife filed for an ex-parte divorce while working undercover.
When Charlotte was presented with an opportunity to finally close the chapter of Rhett and his estranged wife forever, she snatched it up, regardless of the danger it presented.
But when Rhett learns about this operation, he must race against time to save only one—the partner who has always stood by him or the wife who abandoned him.