Quotation from: Secret Adversary

Written by: Agatha Christie

"About nine-thirty or ten, but I could go back earlier."

"You must not do that on any account. It might arouse suspicion
if you did not stay out till the usual time. Be back by
nine-thirty. I will arrive at ten. Mr. Hersheimmer will wait
below in a taxi perhaps."

"He's got a new Rolls-Royce car," said Tuppence with vicarious
pride.