Maybe this was originally a Christmas special, but it is airing for the UK in April, which seems a little odd.
Julia has been left a house in the will of an ex-patient, on the condition it becomes an orphanage. Together with Mr and Mrs Brackenreid, George and Effie, Henry and Ruth Newsome, and her husband, she goes there to spend Christmas, also in the company of the three creepy members of staff. Soon someone is trying to kill her, but why? The house, with it's myriad of passageways, is gorgeous. Meanwhile back in Toronto, Detective Watts and Miss Hart try to find the owner of a lost puppy, with the assistance of three young orphans.
There's plenty to enjoy amongst the festivities, and it's truly a delightful episode.