Injured in a brutal hit-and-run by a serial killer, sidelined to desk duty, and staring down her fifties, Diana is running out of chances—and patience. Then a late-night call pulls her back into the field.

Witness to a murder, Naomi Happleburn is a withdrawn graphic designer whose acute hearing and quiet life make her an unlikely key to the case. But Naomi saw something she wasn't meant to see. Now she's being watched—and hunted.

Assigned to protect her, Diana finds herself drawn into a dangerous investigation where trust is fragile, motives are murky, and getting too close could cost them both everything.

Can Diana keep her safe, or are they Dangerous Allies?