When her sister Lila and brother-in-law Gray are killed in a tragic accident, Bella is named as guardian to her two young nephews. Then she discovers that she’s expected to co-parent with Gray’s best friend, and grief turns to shock. Noah has always driven her crazy, and Bella’s sure the arrogant, handsome Navy SEAL is the last person she wants to share a life with. Just as it seems they’ll never see eye to eye, letters from Lila start to arrive—letters she wrote in case they ever ended up in this situation. And so the reluctant couple follows her instructions, spending ever more time together as part of their unexpected, unconventional family. Forced into an impossible situation, will these letters from the past bring them together? Life as We Know It meets P.S. I Love You in this heartwarming story of loss, grief, family and love.