Max by Sonny - Simon Moffett

Sonny draws a graphic novel, much darker than he expects.  Why is Max, his cartoon bread and butter, so keen for Sonny to finish it?
It brings new characters into Sonny’s life:  
Tony, newly widowed, facing retirement and with his plans in ruins; 
Lisa, young, capable and attractive, facing hard truths about her career choices; 
Elin, an art teacher struggling with negative equity and trying to do the best for her teenage daughter, Megan; 
And Cheryl, a young PC, haunted by a murder that hangs over all of them.

But what connects them?