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 - which leaves Emma to deal with Ollie's move into his new flat by herself.

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.