Mad Is the Heart — Denise Robins

Heiresses twice over, Viola and her young sister Giselle, traveled to exotic Khartoum to be with their guardian, the sophisticated rock-steady Lionel. But Viola's excitement was spoiled by her sister's obvious infatuation with Lionel -- and the presence of the out-going Ted, Viola's determined suitor. Violently objecting to a marriage between Viola and Ted, Lionel proposed himself -- and Viola, already deeply in love with him, happily accepted. But her chance for hapiness was destroyed by the vengeful Ted --who knew of Lionel's financial affairs. Viola could never be sure if Lionel really loved her--or her money....