A former boxing champion, now an innkeeper, is accused of stealing a watch from a party of guests at his inn, who happen to be members of English royalty. The old man is arrested and thrown in prison. His son, knowing that his father didn't steal the watch and suspecting a frame-up, follows the royal party to London, where he poses as a wealthy "gentleman" and insinuates himself into the English court in an effort to find out who framed his father and why.
Barbanas Barty inherits some money, sets off to London, meets and falls in love with Lady Cleone Meredith, and this does not set well with Sir Mortiner Carnaby, who has eyes on the fair lady himself. Barnaby becomes friend with Viscount Devehon, buys a horse from him and enters it in the big steeplechase. Sir Mortimer takes steps to rid society of the presence of this non-gentleman.