Danielle Valentine is a pseudonym for young-adult novelist Danielle Vega. Her work, which includes The Merciless series, has been optioned for film and television by Lionsgate and ...ver maisDanielle Valentine is a pseudonym for young-adult novelist Danielle Vega. Her work, which includes The Merciless series, has been optioned for film and television by Lionsgate and Warner Bros and has been translated into dozens of languages worldwide. She lives outside of New York city with her husband, daughter, and two ornery cats. Delicate Condition is her first adult novel.ver menos