ABANDONED. Please help me find the book my seatmate was reading on the plane

[Jeff]

A doctor goes mountain biking and finds a downed rider he goes to help only to realize its a trap. As he runs away he is able to send a text before he is beaten

[Lobstergirl, au gratin]

Fiction or nonfiction? Remember the cover?

[Jeff]

I am guessing modern fiction. I was reading it on the lady next to Me's Kindle

[Lobstergirl, au gratin]

Jeff left the group. Moving to Abandoned.