Mrs Jeffries Rocks The Boat

Mirabelle Daws travelled all the way from Australia to Sheridan Square to visit her sister - only to die in the middle of a locked garden. All the residents of Sheridan Square have a key to the garden - but no-one seemed to know that Mirabelle was planning to arrive. So the question facing Mrs. Jeffries and Inspector Witherspoon is: who wanted to make sure that Mirabelle's visit was very, very short-lived?
Praise for the Mrs Jeffries Mysteries:
'It's murder most English all the way!' The Literary Times

'Fascinating murder mystery . . . wit and style . . . a winning series. Mrs. Jeffries is the Miss Marple of Victorian Mystery' The Paperback Forum