In a new interview with Finland's Chaoszine, MEGADETH leader Dave Mustaine spoke about his next memoir, 'In My Darkest Hour', which will arrive on September 8, 2026 via Grand Central Publishing's Da Capo imprint.

The book will detail Mustaine's 'gnarly' treatment after he was diagnosed with squamous cell carcinoma at the back of his tongue in 2019.

The book is scheduled to be released on September 8, 2026, and it marks a new chapter in Mustaine's life as he continues to fight against cancer.

The memoir will cover everything from his diagnosis to his journey through treatment and beyond.

Mustaine shared some insights into his experience with cancer in the interview with Chaoszine, saying that chemotherapy has a 'terrible effect on your memory' and describing it as 'scary stuff'.

He also reflected on how confronting death brought him closer to his family and taught him how to ask for help.

The book is co-written by The New York Times journalist Joe Layden, who previously worked with Mustaine on his autobiography.

It will explore the harsh truths and raw realizations that can only come from confronting death, according to the official description of the book courtesy of Da Capo.

Mustaine's memoir joins a long list of music-themed books released by Grand Central Publishing's Da Capo imprint, including works about iconic musicians like KISS guitarist Ace Frehley.

It marks another milestone in Mustaine's remarkable career as a musician and writer.

The release date for 'In My Darkest Hour' is September 8, 2026.