S04E01 - Theory

S04E02 - Proof

S04E03 - Bird Of Passage

S04E04 - See The Rabbit

S04E05 - Take Them In Singles

S04E06 - Red Herring

S04E07 - Five Pairs O' Hands

S04E08 - Minor Incident

S04E09 - An Old Song

S04E10 - Big Boats, Little Boats

S04E11 - For A Rainy Day

S04E12 - Assistance

S04E13 - Equal Status

S04E14 - Obstruction

S04E15 - Going Quietly

S04E16 - On Christmas Day In The Morning

S04E17 - Departure

S04E18 - Cross Reference

S04E19 - Run For The Hills

S04E20 - Pressure

S04E21 - A Quantity Of Gelignite

S04E22 - Critical Path

S04E23 - Persistence

S04E24 - Second Chance

S04E25 - How's The Wife Then ?

S04E26 - Right To Search

S04E27 - Proved Connection