Ferro Olivetti, umuherwe ukomeye w’i Milan, aba afite byose—amafaranga, ububasha, n’ubuzima bw’igitangaza. Ariko se, uri ku mva, amusaba ikintu kimwe cy’ingenzi: kumara ukwezi kumwe i New York nta mafaranga, nta izina, nta butunzi—ngo amenye uko ubuzima bumeze ku bantu basanzwe.

Ferro yemera, yinjira mu buzima busanzwe, akabaho nk’umuntu utagira aho aba. Aho niho ahurira na Diana, umukobwa ukora mu bijyanye n’ubucuruzi bw’inzu, w’umunyabwenge kandi utuje. Ntamenya ko Ferro ari umuherwe, ahubwo amukunda nk’umuntu usanzwe.

Uko ukwezi kugenda gushira, Ferro atangira kwibaza ku buzima bwe: Ese amafaranga niyo agena agaciro k’urukundo? Ese Diana azamwihanganira igihe azamenya ukuri? Ese azahitamo gukomeza ubuzima bw’ubutunzi cyangwa azahitamo urukundo rudasanzwe?

My Secret Billionaire ni inkuru y’urukundo, kwiyakira, n’uburyo umuntu ashobora gusanga agaciro nyako k’ubuzima atari amafaranga, ahubwo ari abantu bamukunda uko ari.