Ollie swaps the job book for a fancy new phone app, which soon lands him in hot water. Tensions between Emma and Liz rise, while Darren struggles to come to terms with fatherhood.

Ollie suspects Darren of moonlighting with a rival firm and hires a new assistant. Darren soon finds himself in way over his head. Meanwhile, Emma quickly wangles herself a promotion at work.

When Darren fails to turn up for work Ollie, Liz and Tony must investigate his whereabouts, unravelling an action-packed mystery.

Ollie inadvertently arranges a date with an old flame, Emma discovers that Tony has managed to get a date of his own, and Darren is left alone to work for a client with whom he shares a bitter past.

Ollie's dropped from his five-a-side football team in favour of a younger player, and takes the situation particularly badly. Meanwhile, Liz has a new boyfriend.

Darren betray Ollie with severe consequences. Ollie must also contend with the possibility that Emma may not be the perfect girlfriend he thought she was.