Witness (1985)

Plot:

When a young Amish woman and her son get caught up in the murder of an undercover narcotics agent, their savior turns out to be hardened Philadelphia detective John Book. Harrison Ford is sensational as Book, the cop who turns head-on into the non-violent world of the Pennsylvania Amish community. The end result is an action packed struggle of life and death, interwoven with a sensitive undercurrent of caring and forbidden love.