Not sure why people are saying there's so much profanity in this series. It's honestly not that much, the first f word wasn't until 19:50 minutes and the first s word was at 17:23 minutes (not like another review said there was so many within the first 15 mins - no clue what show that reviewer was watching...as reading that review I thought it was going to be very liberal with the profanity), as it honestly wasn't that much profanity, only 9-10 instances in the whole first episode, and they were very spread out within the episode and then had 2-3 within two or three sentences of dialogue. Also they're teenagers - maybe spend some time with them, as they curse a lot when not in the company of adults, so yeah...I found that it was actually pretty realistic. The background music has a bit of profanity, but the character's dialogue isn't bad...at least in the first episode.
Also if you've read the novel, yes some characters have been changed a bit, but Harlan Coben was HEAVILY involved in the production. I've only watched one episode so far but this seems to be ramping up to definitive Coben's twists and turns. Can't wait to see what else is in store.