Flora "doesn't do people", not since the Incident that led to her leaving school midway through her GCSEs. The Incident that led to her being diagnosed with bipolar II. The Incident that left her in pieces.
Until Hal arrives. He's researching a story about a missing World War I soldier, and he wants Flora's help. Flora used to love history before the Incident, but spending so much time with Hal is her worst nightmare.
Yet as they begin to piece together the life of the missing soldier, a life of lost love, secrets and lies, Flora finds a piece of herself falling for Hal.