Clive Macmillan was the first husband of Grace Burgess. He was a rich banker who lived in Poughkeepsie.
Series 2 · 1922
Grace is now married to him. When they're in London, Thomas Shelby, Grace's ex-lover calls Grace at the Ritz Hotel in London, but Clive answers the phone, Thomas doesn’t say anything, just puts the phone back down.
Grace lies to Clive and runs out to see Thomas at his sister's house in Primrose Hill. Later, Grace tracks Thomas to the Epsom Races, where she tells Thomas she doesn't love Clive but loves Thomas. Moreover, she’s now carrying Thomas' child.
Series 3 · 1924
During the time lapse, he committed suicide after knowing that Grace had an affair with Thomas