I found you: a novel by Lisa Jewell (Atria Books, 2017)
This seemingly ordinary novel about a single mom somewhere in England (I don’t know English geography very well) sort of turns into a murder mystery when we’re not looking. A man shows up in a beach town without his memory and the single mom takes him in (knowing this is probably a stupid move). Meanwhile other pieces of the story are narrated as seemingly separate stories about a young foreign bride and a family with two teenagers, which eventually all come together. This is a well-written novel which keeps the reader wondering what will happen next, without so much graphic violence that you can’t sleep until you’re done. The character development is also very good, and the descriptions of life in England are a change of pace for American readers. I will probably seek out other books by Lisa Jewell.