“I am a sexual predator. I need help.”

Those chilling words were written by Ariel Castro, the man charged with kidnapping and raping three women, imprisoning them in his Cleveland house for a decade.

After neighbors helped free Amanda Berry, Michelle Knight and Gina DeJesus, cops found a letter written by Castro as they searched the house of horrors at 2207 Seymour Avenue.

"They are here against their will because they made a mistake of getting in a car with a total stranger,” Castro wrote, according to reporter Scott Taylor of WOIO-TV in Cleveland. Taylor obtained a copy of the letter, which was written in 2004.

Castro appeared before a judge on Thursday and bail was set at $8 million at his arraignment. The assistant prosecuting attorney told the judge that "today the situation has turned" and the captor was now the captive.

In the thorough search of his home, the letter was found and it offers an even more disturbing insight into Castro.