Series stars Rupert Penry-Jones, Phil Davis and Steve Pemberton all return as members of a Police squad investigating crimes inspired by legends of the East End.
The series is produced by Carnival Films for ITV and has been a huge hit both in the UK and internationally, including in the US where it airs on BBC America.
The fourth series consists of six new episodes and will air this autumn.
Check out this glimpse of the spooky things to come….