The pacing is spot on, and Edgerton always keeps you guessing. He drops just enough hints at Jake's prison back story to make you curious to find out more. And he keeps the tension of the core plot cranked way high, making you anxious to see what'll happen next. What's more, he makes you care about Jake. At the heart of this story is Jake's marriage, which comes off as a very real relationship, full of bursts of passion, smoldering resentments, tender moments, and enduring hope.
This is a brilliant example of how genre fiction (in this case, thriller) can be every bit as poignant and expertly-crafted as "literary fiction." Buy it, read it, and be prepared to lose sleep over it.