In a boxy apartment building in an Illinois college town, Romola Mitra, a newly arrived young bride, anxiously awaits her first letter from home in India. When she accidentally opens the wrong letter, it changes her life. Decades later, her son, Amit, back in the U.S., finds the same letter and thinks he has discovered his mother's secret. But secrets carry within them their own secrets sometimes.

Amit does not know that Avinash, his devoted father, lurked on gay chat rooms at times, unable to set aside his lifelong attraction to men. Avinash, for his part, had no idea about the memories of a starry romance his dutiful wife kept tucked away among her silk saris. As Amit settles down as a computer engineer in San Francisco, he too is torn between his new life here and his duties toward the one he has left behind in India.

Don't Let Him Know sweeps up multiple generations of a family, moving from an illicit encounter in a Calcutta park to an unlikely friendship forged at a Carbondale gay bar, from midnight snacks of a great-grandmother's mango chutney to wayward temptations at a McDonald's drive-thru. Tender, funny, and beautifully told, it is an unforgettable story about the sacrifices we make for those we love.