Seasoned detective John Cardinal rejoins the murder squad of his rural Ontario (Canadian) PD, which he left after the case he was obsessed by was closed, as a new corpse, frozen in pond, may allow reopening it given the off MO. Grudgingly he accepts as new partner Lise Delorme, recently transferred from financial crimes, but soon finds her useful to help prove his serial killer theory, while ignoring she's instructed by IA to seek a mole. Another fitting murder is found.
—KGF Vissers