Officers moved into the family's £1.2million country house but there was no sign of the family, who are feared to have died in the blaze.
But by the time a fire - started deliberately in three places - ripped through the house early on Tuesday morning, Mr Foster's success was nothing but a facade.
Today police said that 'every possible scenario' behind the fire was being considered and they were following up all possible lines of inquiry.
West Mercia Police Superintendent Gary Higgins said: "There is extensive debris at the site and it will take some days, possibly several weeks, to complete this part of the investigation. We will be seeking to build up a picture of the circumstances leading up to the fire."
Meanwhile police are developing profiles for all three family members.
Mr Higgins added: "I'm aware there is a lot of speculation concerning this incident and we are anxious to clarify the exact circumstances as soon as possible."
Foster's business, which owed more than £1million to creditors and £800,000 in tax, had collapsed and he was forbidden to sell the house without permission of the liquidator, it emerged today.