Behind every mask lies a killer truth. Mick Jagger. Bob Dylan. Paul McCartney. David Bowie. Debbie Harry. They're icons. Legends. And together they form the ultimate supergroup - The Okay Boomers. It's quite some band and it's quite incredible to see them playing the Bull's Head in Barnes on a Sunday night. But all is not as it seems. Hiding behind lifelike masks are five local celebrities. Desperate to keep their identities secret, they are all unmasked when a body is discovered in the lead singer's garden the morning after their post-gig party. Who is the victim? Why was he wearing the lead singer's Mick Jagger mask? And why have all the other masks disappeared? Enter DI Garibaldi, a poetry aficionado with a penchant for country music and the Met's sole non-driving detective. As he investigates the five members of The Okay Boomers – a fading rom-com heartthrob, a high-profile comedian, a controversial TV pundit, a popular poet, and a national treasure – one thing becomes clear: behind every mask lies a killer truth.