FLORISSANT • The arsonist got away, but he left his keys behind. And on the key ring was a rewards tag that helped police track down the owner.

Florissant police say Adam C. Grant set three vehicles on fire early Saturday in the 3100 block of Cross Keys Place and the 13700 block of New Halls Ferry Road.

Police Officer Andy Haarmann said detectives found keys left at the scene of one of the arsons and tracked down their owner, Grant. He confessed to setting the vehicles on fire. Court records identified the cars as a PT Cruiser, a Nissan Pathfinder and a Chevrolet van.

The Cruiser and Pathfinder were on Cross Keys; the van was on New Halls Ferry and owned by the Tender Care Learning Center.

Grant, 19, of the 13700 block of New Halls Ferry Road, was charged Sunday with three counts of knowingly burning. Bail was set at $50,000.

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