Caryl Lewis is a multi-award-winning Welsh novelist, children's writer, playwright and screenwriter. Her breakthrough novel Martha, Jac a Sianco (2004) is widely regarded as a modern classic of Welsh literature, and sits on the Welsh curriculum.

The film adaptation - with a screenplay by Lewis herself - went on to win six Welsh BAFTAS and the Spirit of the Festival Award at the 2010 Celtic Media Festival. Lewis's other screenwriting work includes BBC/S4C thrillers Hinterland and Hidden. Lewis is a visiting lecturer in Creative Writing at Cardiff University, and lives with her family on a farm near Aberystwyth. Drift is her debut novel in the English language.