Jim Warner Wallace was a detective who investigated cold cases. He decided to investigate the Gospels and discovered that Jesus is real, which led to a change of heart:
Matthew 7:7 King James Version (KJV)
7 Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you:
John 14:6 King James Version (KJV)
6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.