As I recall Max had a row with Lucy in the car sales office , she falls to the floor and knocks her head. The row being over Lee. Later that day Max receives anonymous message saying something to the effect " I know what you've been doing" ,plus a photo of him and Lucy together. Friday 18th April was Good Friday the day Lucy's body was found . So whether Abi is the phantom message sender hence Abi's comment ? Agree would love to know what's going on in Keeble's head.
P.S . My shortlist :) ! of suspects for the murder is now up to twelve , Abi the latest addition , after the Halloween plot.:D