It was a good show, they had that nice arc to the first season that as you said did kind of wrap up. They did leave a few things hanging and open for the 2nd season to pick up, but alas, we won't see it.
It was actually a slight flip around of a show called New Amsterdam a few years back, an immortal who ends up a homicide detective who worked with a medical doctor..
Anyhewt, it's kind of interesting how many series these days seem to involve some variation of an Englishman with strange powers teaming up with an attractive American cop and saving lives in a quirky manner. Forever, Sleepy Hollow, Elementary, Lucifer...