Motorcross bikes and cash were stolen during a burglary at a Totternhoe home in the early hours of Monday morning.
Thieves forced entry to the house in Church Road between 2am and 4.30am on 27 April while the occupants were asleep.
They then rampaged through the downstairs rooms and garage before making off with a blue and white Yamaha Yz250F bike and an orange and black motorcross bike, as well as money.
Detective Constable Matt Shepherd said: “This burglary was particularly distressing for the occupants of the home as it took place while they were inside.
“I am appealing to anyone who has any information about the break-in, or comes across these bikes, to contact me immediately so that we can find the offenders responsible.”
Anyone with information is asked to contact police immediately using the non-emergency number 101 or text 07786 200 011.