RED LIGHTNING. Publication date: April 4, 2006.

It looks like the HMTP will have to be modified to accomodate Varley's new book.

Here is the Book Description:
The son of one of the first men to fly to Mars and back, Ray Garcia- Strickland, is now a disgruntled Martian, tired of the Red Planet's overdevelopment and the gravity dependent tourist Earthies. But that doesn't stop him from fearing the worst when Earth is struck by an unknown object, causing a massive tsunami. Living high on his father's glory was okay, but now Ray must literally come down to Earth-and solve one of its greatest mysteries.

The hardcover is $16.47 on Amazon. I plan to preorder.