Mathilde Eiker was born in Washington, D.C., the daughter of a chief clerk of engineers in the U.S. War Department. After earning her B.A. from George Washington University in 1914, she published some short stories under a pseudonym. Her first novel, Mrs. Mason's Daughters, published in 1925, was a sucess. Her subsequent books included
Over the Boat-Side (1927),
The Lady of Stainless Raiment (1928),
Stranger Fidelities (1929), My Own Far Towers (1930), The Senator's Lady (1932). The Heirs of Mrs. Willington (1934), and Key Next Door (1937). As March Evermay, she also wrote three detective novels, They Talked of Poison (1938), This Death Was Murder (1940), and Red Light for Murder (1951), her final book.
She also taught English at Woodrow Wilson High School in Washington, D.C., into the 1950s.