New Delhi, June 9 (ANI): Michael Gambon and Keeley Hawes will be playing the leads in the TV adaptation of JK Rowling's 'The Casual Vacancy'. In this first novel for adults by the author after Harry Potter series, Gambon will be playing Howard Mollison, the owner of the Pagford delicatessen and Hawes will take on the role of his daughter-in-law Samantha Mollison in the mini-series which is a joint venture of BBC and HBO, a leading daily reported. The series also feature Rory Kinnear, Monica Dolan and Julia McKenzie.