Circle of Death (Young Indiana Jones #3) by William McCay

"Herman, is that stone bleeding!?"

What's going on? Indy and his friend Herman are in England exploring a mysterious ruin called Stonehenge. But the anxient stones are doing some strange and scary things. And lurking nearby is a pack of sinister, dark-robed men-- lead by a real-life wizard! The wizard's plans threaten the peace of the world. Is anyone brave enough-- or crazy enough-- to try and stop him? But of course, young Indiana Jones!