Terriers is a procedural, but the execution is largely free-form, with no definite timings or twists that you'd see on a normal procedural. Cases don't present themselves in the beginning, and Hank and Britt do whatever they want during their investigation. It's very freeing compared to the restraints on typical procedurals.
"Missing Persons" only features one person who's actually missing, a college student, but almost every other character is missing inside their heads. The guy who kidnapped her is missing almost all his memories. Steph realizes she isn't getting better after imagining a long sequence of events, forcing Hank to let her go to a hospital. At the same time, Hank is bound by Katie's secret and struggles to keep the truth from Britt, as Britt is more and more distressed about Katie's attitude. And of course Katie doesn't know what to do and pulls back into a defensive shell.
I'm disappointed we won't be seeing Steph, at least for a few weeks, but the overall effect is that everyone's problems deepen as this season progresses. It's not Lindus or the trial anymore that keeps them down--it's themselves.
Score: 9.0/10