Cal. PEN § 210

Every person who for the purpose of obtaining any ransom or reward, or to extort or exact from any person any money or thing of value, poses as, or in any manner represents himself to be a person who has seized, confined, inveigled, enticed, decoyed, abducted, concealed, kidnapped or carried away any person, or who poses as, or in any manner represents himself to be a person who holds or detains such person, or who poses as, or in any manner represents himself to be a person who has aided or abetted any such act, or who poses as or in any manner represents himself to be a person who has the influence, power, or ability, to obtain the release of such person so seized, confined, inveigled, enticed, decoyed, abducted, concealed, kidnapped or carried away, is guilty of a felony and upon conviction thereof shall be punished by imprisonment for two, three or four years.

Nothing in this section prohibits any person who, in good faith believes that he can rescue any person who has been seized, confined, inveigled, enticed, decoyed, abducted, concealed, kidnapped or carried away, and who has had no part in, or connection with, such confinement, inveigling, decoying, abducting, concealing, kidnapping, or carrying away, from offering to rescue or obtain the release of such person for a monetary consideration or other thing of value.