What is the name of the person who approached Blore about coming to the island?

From the text:

"You gentlemen have got me wrong," he said. "I've got my credentials and you
can see them. I'm an ex-C.I.D. man. I run a detective agency in Plymouth. I was
put on this job."

Mr. Justice Wargrave asked: "By whom?"

"This man Owen. Enclosed a handsome money order for expenses and instructed me as to what he wanted done. I was to join the house party, posing as a guest. I was given all your names. I was to watch you all."