Which British author prompted a nationwide search in 1926 by disappearing for 11 days?

How smart was that, check into a hotel in your husband's lover's name, and no body twigged it!!

I knew this only because I'd watched a Doctor Who episode called The Unicorn And The Wasp.

MaffysDad, an amazing.episode!!! I need a shock!!!

MaffysDad, love that episode