Tom Hardy, Soviet hero of World War II, solves murders in 1950s Russia. Well, actually, there could be no murders under Communism, or so everyone tells one another in Child 44, because that’s a crime of decadent Western capitalism. Nevertheless, there are a lot of boys dead under suspicious circumstances all over southwestern Russia. Based on a novel inspired by the same real-life Soviet serial-murder case that the far superior 1995 HBO movie Citizen X details, this is an odd duck of a film: overly complicated yet somehow anticlimactic, more concerned with professional and personal jealousies among elite military investigators in Moscow than with police procedural, and eventually descending into disappointingly rote potboiler stuff. The doublethink and collective self-delusion of Soviet life keeps sidling up to something potentially interesting, but it’s most tantalizing for where it never goes. I kept expecting to discover that sneaky maneuvering was driving what seems like a coincidental stumbling over the case by Hardy’s (The Drop) Leo Demidov: you know, backroom skullduggery by men smart enough to know that denying the reality of a serial killer is politically necessary but pragmatically irresponsible, so let’s “demote” Leo and exile him straight into the path of piles of evidence. But no: it all really is just coincidental. Still, the cast — which also features Noomi Rapace (Prometheus), Joel Kinnaman (Run All Night), Jason Clarke (Dawn of the Planet of the Apes), Gary Oldman (RoboCop), and Paddy Considine (Pride) — is as enjoyable to spend time with as they always are. But it does all feel constructed more with pat Hollywood pomp rather than the authentic grit it demands.