Los Angeles lawyer Lena Antinori has dedicated her career to fighting discrimination, including for the LGBTQ community, but her own family's secret haunts her. At thirteen years old, she made the startling discovery that her father, Frank, was gay and her mother, Teresa, knew. Fearing social stigma, Teresa instituted a code of silence meant to protect their Italian Catholic family—a code Lena adhered to for decades.

Now, Frank plans to marry his partner, and he wants Lena to help plan the wedding. Lena is torn between maintaining loyalty to her mother and supporting her father's newfound happiness. As her father’s wedding approaches, Lena learns her childhood wounds run deeper than she thought, and failing to heal them might sentence her to a life of hypocrisy and the inability to discover the true meaning of coming out.

Told by Lena in the present, and her parents, Frank and Teresa, in the past, Everything We Thought Was True examines how the truth doesn't set you free until you embrace it.