Follow Through is the 1393rd episode of The Bill.
D.C. Holmes goes undercover as a prison inmate to crack a drugs ring following a violent assault on one of the prisoners, Claire Sims. She gets herself associated with the prime targets, Rita Davis and Jo Merton, but finds that the pair are more interested in her looks than her skills. When Holmes uncovers evidence of a corrupt officer, D.S. Daly gets Davis transferred to another wing in order to allow Holmes to take over her part in Merton's operation. However, the corrupt officer becomes suspicious of Holmes, putting two and two together realises that she is a cop. Merton goes wild and tries to assault Holmes, but after a little assistance from Daly, Holmes finally gets her body.
- Joy Brook as D.C. Holmes
- Libby Davison as D.C. Rawton
- Ray Ashcroft as D.S. Daly
- Peter Ellis as Ch. Supt. Brownlow
- Simon Rouse as D.C.I. Meadows
- Shaun Scott as D.I. Deakin
- Billy Murray as D.S. Beech
- George Rossi as D.C. Lennox
- Iain Fletcher as D.C. Skase
- Lisa Geoghan as P.C. Page