Gytha Lodge read English at Corpus Christi, Cambridge from 2002-2005, and it was there that she first began writing and staging theatrical productions. She won the 2009 Geoffrey Whitworth Award for best UK play and set up her own theatre company and began to tour productions. Her one-act play Otherwise won a Fringe award in 2010 for best new play and was selected for Leicester Square Theatre’s best of the fringe run.

After beginning the UEA Creative Writing MA in 2011, Gytha began writing for screen and in prose. She was shortlisted for the Yeovil Literary Prize and the Arts' Council England fiction awards, and developed a very large online following for her young adult and children's writing, with over a million reads accrued on platform Wattpad. Her first novel She Lies in Wait was published in March 2019 by Michael Joseph; it is a Sunday Times Top 10 bestseller, and a Richard and Judy Book Club pick for winter 2019. Her fourth novel Little Sister publishes April 2022.